The family of ISIS bride Shamima Begum today vowed to take Home Secretary Sajid Javid to court to stop him taking away her British citizenship.

The remorseless 19-year-old is in a Syrian refugee camp with her newborn son but Mr Javid has moved to ensure she will never allowed back into Britain after she fled to join Islamic State.

The Home Office will argue that because Begum's mother was born in Bangladesh her daughter is entitled to dual citizenship meaning she would not be left stateless, which is illegal under international law.

But Begum's family says she does not have a Bangladeshi passport and has never been there, making Mr Javid's decision illegal, they claim.

The teenager, who fled Britain with friends aged 15 and married a Dutch jihadi, has been unapologetic about ISIS' crimes and said the Manchester Arena suicide bombing could be considered 'retaliation'.

She also insists that the British public should be 'sympathetic' towards her and should be allowed back to London with her baby on human rights grounds.

But last night Sajid Javid last night moved to block her return to Britain arguing that taking away her British citizenship is 'conducive to the public good' on terrorism grounds.

ISIS bride Shamima Begum has had her citizenship revoked according to a letter from the Home Office to her family

The letter obtained by ITV News asks Begum's family to inform her of the decision to revoke her citizenship and her right to appeal it

Shamima is pictured walking through Gatwick Airport on February 17 2015 as she left the UK

Begum's family solicitor Tasnime Akunjee said Shamima said last night was 'surprised' Mr Javid had come to his conclusion.

How Britain can strip citizenship from its enemies - as long as they are not 'stateless' Shamima Begum, who fled the UK to join the Islamic State terror group in Syria aged 15, has been stripped of her British citizenship. Home Secretary Sajid Javid ordered the move against the 19-year-old Londoner who wants to return to the UK with her newly-born child as the so-called caliphate crumbles. International law forbids nations from making people stateless by revoking their only citizenship. Britain appears to believe that Ms Begum, who is of Bangladeshi heritage, holds dual citizenship. Under the 1981 British Nationality Act, any Briton can be deprived of their citizenship if it is 'conducive to the public good' - and they do not become stateless as a result. A 2017 government report on the issue said the Home Secretary has the power to 'deprive a person of British citizenship' if it would be 'conducive to the public good'. However, this only applies if the person would not be left stateless. If it is the case Ms Begum is a dual national, she could have her British citizenship stripped. Begum has the right to appeal the decision to the Special Immigration Appeals Commission (SIAC). The SIAC is independent of the Government and allows individuals to appeal against immigration decisions by the Home Office, such as deportations and the removal of citizenship. Those who are outside of the UK have 28 days to lodge an appeal from the time they receive their Home Office letter. Amendments were made to British national laws in 2014 which made it easier to strip dual nationals of their British citizenship. These measures were primarily aimed at terrorists who could potentially undermine UK security, for example those who fled to Syria to fight and were attempting to return home. There are two other instances when British citizenship can be removed, which are permissible even if the person would be rendered stateless. Deprivation of citizenship can be made if a person obtained their citizenship through registration or naturalisation and the Home Secretary is 'satisfied that this was obtained by fraud, false representation or the concealment of a material fact'. Secondly, when citizenship is obtained through naturalisation and the Home Secretary believes that removing it would be 'conducive to the public good' because the person acted in way which is 'seriously prejudicial to the vital interests of United Kingdom, any of the Islands, or any British overseas territory'. Advertisement

He said the family will 'consider all legal avenues to challenge this decision' in response.

The family, from Bethnal Green in east London, were notified via a letter saying Home Secretary Mr Javid had started the process that will see Begum permanently banned from the UK.

The family are 'very disappointed' by Mr Javid's decision, according to statement by Mr Akunjee.

The Home Office letter asks that they pass on the decision - including that she has a right to appeal it - to Begum, who left their home in 2015 when she ran away with two school friends to join ISIS.

She is now stranded in a refugee camp in Syria as the so-called caliphate crumbles.

'Please find enclosed papers that relate to a decision taken by the Home Secretary, to deprive your daughter, Shamima Begum, of her British citizenship,' the letter reads.

'In light of the circumstances of your daughter, the notice of the Home Secretary's decision has been served of file today, and the order removing her British citizenship has subsequently been made.'

Only last week Britain's MI6 chief said that UK nationals, even those who are members of terror organisations like ISIS, have a legal right to return home.

Government guidance from 2017 states that the Home Secretary has the power to order the deprivation if it would be 'conducive to the public good', as long as they are not left without any citizenship.

A Home Office spokesman said he could not discuss individual cases, but added: 'We don't leave people stateless.'

Mr Javid on Monday told the House of Commons: 'The powers available to me include banning non-British people from this country and stripping dangerous dual nationals of their British citizenship.'

Over 100 people have already been deprived in this way.

What will happen to Begum's new born son, however, remains unclear.

He was born before his mother was deprived of citizenship - meaning he is still legally British.

And while theoretically he could also have his citizenship revoked, the government would need to show he himself posed a threat.

Begum's first two children both died of unknown illnesses under ISIS.

Liberal Democrat home affairs spokesman Sir Ed Davey accused Mr Javid of 'an abdication of responsibility' by 'palming off' Begum on to another country.

'The UK has more than enough terrorism laws to prosecute Shamima Begum here,' he said.

Meanwhile Conservative chair of the Commons Education Committee, Robert Halfon, who had spoken out against allowing Begum to return, said in a tweet that Mr Javid had made 'absolutely the right decision'.

The move comes after Begum returned to the public eye when she was found heavily pregnant living in a refugee camp in northern Syria.

She gave birth to a boy over the weekend, having already lost two children, and made pleas for forgiveness and to be accepted back in the UK.

Earlier on Tuesday, Metropolitan Police Commissioner Cressida Dick said the 19-year-old could expect to be 'spoken to' if she comes back to Britain.

The initial police stance when Ms Begum left the UK in 2015 was that she may be treated as a victim of grooming, but the Scotland Yard chief said: 'We're a long way down the road since then.'

She added: 'If she does, under whatever circumstances, arrive at our borders, somebody in her type of circumstances could expect, of course, to be spoken to and, if there is the appropriate necessity, to be potentially arrested and certainly investigated.

'If that results in sufficient evidence for a prosecution then it will result in sufficient evidence for a prosecution.

'The officers will deal with whatever they are confronted with.'

Metropolitan Police Commissioner Cressida Dick previously said counter-terrorism police officers will 'deal with whatever they are confronted with' if Begum returns to the UK

On Monday in an interview with the BBC Ms Begum compared the Manchester Arena bombing to military strikes on Isis strongholds, calling the terror attack 'retaliation'.

There are currently plans to change the law to make travelling to certain terror hotspots a criminal offence, but this would not apply retrospectively to Ms Begum.

Britons who have been stripped of their citizenship Home Secretary Sajid Javid revealed earlier this month that more than 100 dual nationals who travelled to join IS have had their UK citizenship stripped by the Home Office. But there have been a number of different reasons for which Britons have lost their citizenship over the years - not just for association with Islamic State. The ‘deprivation orders’ can be issued only to those with dual nationality as ministers cannot take away citizenship if it would leave a suspect stateless. Among those to have had their citizenship revoked include: The 'Beatles' who served Jihadi John and beheaded Western hostages on camera Two members of the Beatles, Alexanda Kotey and El Shafee Elsheikh were captured in northern Syria in January 2018. Alexanda Amon Kotey, left, and El Shafee Elsheikh (rigth), who were allegedly among four British jihadis who made up a brutal Islamic State cell dubbed "The Beatles They are currently being held by western-backed Kurdish forces in Syria having been stripped of their British citizenship - with the FBI hoping to put both on trial later this year. Elsheik, 30, is a mechanic whose family fled to the UK from Sudan in the 1990s. Kotey, 34, converted to Islam as a teenager. The two men, who were nicknamed The Beatles by captives due to their British accents, are accused of killing 27 hostages, including British aid workers and American journalists. Man believed responsible for brutal execution tape by Islamic State in 2014 Ali Almanasfi, 28, who was assumed dead after an ambush by Syrian government forces back in 2013, was revealed to still be alive and living in the war-torn country - it was reported in November Scores of his friends and relatives have said that the Almanasfi was the man responsible for a brutal execution tape released by the Islamic State in 2014. Ali Almanasfi, 28, was believed to have been killed in Syria back in 2013 He had his British citizenship revoked by the Home Office last year, a move which his brother says means he will 'die there'. Almanasfi was said to have fallen in with Mohammed Emwazi and Alexe Kotey, who would later become members of the ISIS execution gang known as ‘The Beatles’, after being jailed for a violent assault. Nigerian man known as L2 feared to be planning Paris-style terror attack A Nigerian man closely linked to a group of British Islamists was stripped of his British citizenship in 2013 over fears he was planning a Paris-style terror attack in London. The man, known only as L2 for legal reasons, was a member of the now banned radical group, al Muhajiroun, and was associated with friends of Lee Rigby's killer Michael Adebolajo and Jihadi John. His British nationality was removed by Theresa May after he was deemed such a threat to national security that she personally signed off on an order removing his citizenship. Members of Rochdale paedophile ring Taxi drivers Abdul Aziz, 47, Adil Khan, 48, and Abdul Rauf, 48, were among nine men jailed over appalling crimes against girls in Greater Manchester in 2012. Abdul Aziz (left), 47, and Abdul Rauf (right), 48, are taxi drivers who were both jailed The then home secretary Theresa May ruled in 2015 that all three men - who have dual British and Pakistani nationality - should have their names deleted from the roll of British citizens. The Pakistani men were convicted in May 2012 of preying on girls in Rochdale, plying them with drink and drugs before they were ‘passed around’ for sex. In December, Sajid Javid defended the Government's right to strip the men of their British citizenship and deport them back to Pakistan. Advertisement

Around 425 suspected jihadi fighters are thought to have returned to the UK from Syria so far.

Before today's decision, the Home Secretary had already hinted that he would block Begum from returning to the UK.

Earlier this week Mr Javid told MPs that no British troops would be used to rescue any Britons who travelled to Syria to support terrorism.

He said more than 900 people went to Syria or Iraq, adding: 'Whatever role they took in the so-called caliphate, they all supported a terrorist organisation and in doing so they have shown they hate our country and the values we stand for.'

He went on: 'Now this so-called caliphate is crumbling, some of them want to return and I have been very clear where I can and where any threat remains I will not hesitate to prevent this.

'The powers available to me include banning non-British people from this country and stripping dangerous dual nationals of their British citizenship.'

Begum later told ITV News she did not see why the Home Secretary would see her as a threat.

'I'm a 19-year-old girl with a new born baby. I don't have any weapons; I don't want to hurt anyone even if I did have weapons or anything,' she said.

'He has no proof that I was a threat other than that I was in ISIS, that's it.'

Ms Dick said: 'This case and other cases that are talked about in the same sentences just really underline how awful the circumstances are and have been in Syria and just how dangerous it has been, and would continue to be, for anybody from this country to think of travelling there.

'Dangerous physically and dangerous legally.

'If there is insufficient evidence for a prosecution it is our job to look at the threat they pose if they are returning from Syria and we do that with every single person who comes back from Syria and then manage the risk with colleagues in the (security and intelligence) agencies.'

Begum ran away to marry an ISIS fighter four years ago - but now wants to return to the UK after the terror group's so-called 'caliphate' crumbled into dust.

The young mother also shrugged off the murders of British terror victims in an interview as she claimed they were 'retaliation' for the war being fought against ISIS.

On Monday Begum told the BBC's Quentin Sommerville that she's prepared to be jailed, was a 'poster girl' for the group and still has 'sympathy' for IS.

Mr Sommerville said she had 'little to offer' in apology to the millions of Iraqis and Syrians whose lives were destroyed by Isis.

The BBC's Middle East correspondent added that when she was asked about the treatment of Yazidi women by Isis, she said: 'Shia do the same in Iraq.'

The campaign by Begum's family to have her returned to Britain sparked fresh controversy on Monday when the lawyer representing them, Tasnime Akunjee, compared the radicalised youngster to a 'traumatised' First World War soldier in a TV interview.

When Good Morning Britain presenter Richard Madeley insisted she doesn't look very traumatised, Mr Akunjee replied: 'You might have said the same thing about a First World War soldier in the middle of shell-shock... they are both [in] warzones.'

It also emerged that Begum has called her son Jerah, in what historians have interpreted as a reference to Abu Ubaidah ibn al-Jarrah, a 7th century Islamic warlord.

In other developments yesterday:

A report revealed that a total of 156 cases involving children in danger of being radicalised had come before the British family courts since 2013;

It emerged that a jihadi bride who returned to the UK from Isis territory had been told by the High Court last year that she was too dangerous to raise her toddler daughter;

Scotland Yard commissioner Cressida Dick admitted that Isis brides could not be prosecuted for simply going to Syria.

Mr Javid has the power to strip someone of their British citizenship if they are suspected of being involved in terrorist activity on the basis that that their presence in the UK is not conducive to the public good.

However, he can't exercise this power if it will leave someone stateless. Therefore it has to be used on those with dual nationality.

Sources last night claimed that in Begum's case, she would not be left stateless because she has dual British and Bangladeshi citizenship.

But her family's lawyer Tasnime Akunjee said the teenager was born in London and has only ever held a British passport.

The Home Office is understood to have invoked a Bangladeshi law whereby offspring of those born in Bangladesh are automatically entitled to citizenship of that country.

But it is likely that Bangladesh also has an option to refuse entry to those it considers a security risk.

The plight of Begum's new baby son remains unknown and it is not clear whether the ban on entering Britain also applies to the infant. Her first two children both died of unknown illnesses under Isis.

Last night Liberal Democrat Home Affairs spokesman Sir Ed Davey accused Mr Javid of 'an abdication of responsibility' by 'palming off' Begum onto another country.

'The UK has more than enough terrorism laws to prosecute Shamima Begum here,' he said. 'It's disappointing that the Home Secretary has so little confidence in our justice system.

'It is not only hard to see Ms Begum and her baby as constituting a serious threat to national security, but it also seems a huge wasted opportunity. We can learn lessons as to why a young girl went to Syria in the first place; lessons which could improve Britain's security by helping us prevent this happening again.'

Labour MP Stella Creasy added: 'However horrific her defence of Isis, if the Home Secretary can start with stripping this woman and her week-old child of their citizenship for his leadership bid... where does it end?'

Shamima Begum, 19 (pictured before she left the country four years ago) is pleading with the government to allow her back into Britain

Begum has named her son Jerah, in what historians say is homage to an Islamic warlord

Who were the five Bethnal Green girls who went to join ISIS? Sharmeena Begum - Flew to Turkey from London Heathrow in December 2014. No relation to Shamima. Unnamed 15-year-old - tried to go to Turkey on the same 2014 flight but was stopped before take-off. Shamima Begum - One of the three who flew from London Gatwick to Turkey in February 2015 and then went on to Syria. Has pleaded to be allowed to return to the UK with newborn son. Kadiza Sultana (left) and Amira Abase (right) from Bethnal Green in east London, travelled with Shamima Begum to Syria in 2015 Amira Abase - Flew out in 2015 with Shamima who said in yesterday's interview she did not know whether Ms Abase was still alive. Kadiza Sultana - Also flew out in 2015. Believed to have been killed in an airstrike in 2016. Advertisement

Shamima Begum (left), who appeared on Sky News on Sunday pleading for sympathy, is like a shell-shocked First World War soldier, her lawyer Tasnime Akunjee (right) claimed

Immigration judges also have the power to reverse decisions to strip citizenship. Two alleged extremists who were stripped of their citizenship by the Home Office won their appeals three months ago on the grounds that the government's intervention was 'unlawful'.

ISIS bride 'names newborn son after Islamic warlord' British ISIS bride Shamima Begum has named her child after an Islamic warlord, historians have claimed. Her chosen name for her son, Jerah, is thought to be in honour of Abu Ubaidah ibn al-Jarrah, who commanded a section of the Rashidun Army in the 7th century. Historian Tom Holland tweeted: 'If she'd wanted to signal that she was returning to Britain in peace, she might have considered naming her baby after someone other than Abu Ubaidah ibn al-Jarrah, a general from the early days of the Arab conquests chiefly famed for beating the c**p out of infidels. 'I guess, in a sense, she stands in the long tradition of British youth, flicking a V at the establishment. But punks were never complicit in genocide.' Jerah was also the name of Begum's first son, who died when she was living under ISIS. Advertisement

The furore erupted after a heavily pregnant Begum was found at a refugee camp in northern Syria by a journalist from The Times.

Like other jihadi brides, she had fled the collapsing caliphate and begged to return to the UK so the NHS can care for her baby.

She declared no remorse over joining Isis and told how seeing a 'severed head' did not faze her.

After giving birth in the camp, she said she did not regret going to Syria because it 'made her stronger' - but said that people 'should have sympathy' towards her.

In one incendiary interview, the jihadi bride said she the devastating bombing on an Ariana Grade concert in 2017 which killed 22 innocent people was 'retaliation' for 'women and children' being bombed in Syria.

Survivors of the Manchester atrocity called her comments 'outrageous' and said she should not be allowed back into the country.

Alex Klis, 21, from York, whose parents Marcin, 42, Angelika, 49, were killed by the blast, told ITV: 'I think she's comparing two things that shouldn't ever be compared. She's saying that there are fighters in Islamic State that are getting killed.

'Those people go there knowing what to expect. People who went to the Manchester Arena, they went there to take their kids to a concert.

'She's out of order, comparing those two things... She's made her bed. I think she should remain where she is.' Begum said before she fled to Syria with fellow Bethnal Green Academy schoolgirls Kadiza Sultana and Amira Abase, she watched Isis videos of 'beheadings'.

She also watched propaganda videos before settling in Raqqa and marrying Yago Riedijk, a convicted terrorist who police believe was part of a cell plotting an atrocity in Europe.

The letter from the Home Office to Begum's mother urged her to make her daughter aware of the decision, but added that she had a right to appeal.

Mr Akunjee said he was considering 'all legal avenues to challenge this decision'.

'The family are very disappointed with the Home Office's intention to have an order made depriving Shamima of her citizenship,' he said. 'The Home Office has tried to do this before and they have lost before.' Earlier, the Met Commissioner said if the teenager returned to the UK she could face questioning but that the current law might not be sufficient to see her prosecuted. She added that many of those who have returned have led 'peaceful lives'.

'If she does, under whatever circumstances, arrive at our borders, somebody in her type of circumstances could expect, of course, to be spoken to and, if there is the appropriate necessity, to be potentially arrested and certainly investigated,' Miss Dick said.

'If there is insufficient evidence for a prosecution, it is our job to look at the threat they pose if they are returning from Syria. We do that with every single person who comes back from Syria and then manage the risk with colleagues in the [security and intelligence] agencies.' There are currently plans to change the law to make travelling to certain terror hotspots a criminal offence, but this would not apply retrospectively to Begum.

Around 425 suspected jihadi fighters are thought to have returned to the UK from Syria so far.