A lawyer working for Shamima Begum’s family has said any attempt to deny her “due process” would mean she was being treated worse than Nazi war criminals after the Second World War.

Tasnime Akunjee said Ms Begum, who was 15 when she left the UK to join Isis in Syria, had been brainwashed and would have to be de-radicalised to return to the UK.

He said: “The Nazis had the Nuremberg trials. They were given due process. This girl was a victim when she went out there at 15 years old. Our politicians are saying that she should be denied protections and due process that would have been granted to Nazis.”

His comments, reported by Reuters, come after the home secretary Sajid Javid said he would not hesitate in blocking her return to the UK.

Writing in The Sunday Times, he said: “My message is clear: if you have supported terrorist organisations abroad I will not hesitate to prevent your return.”

“If you do manage to return you should be ready to be questioned, investigated and potentially prosecuted.”

Timeline of the Isis caliphate Show all 19 1 /19 Timeline of the Isis caliphate Timeline of the Isis caliphate ISIS began as a group by the merging of extremist organisations ISI and al-Nusra in 2013. Following clashes, Syrian rebels captured the ISIS headquarters in Aleppo in January 2014 (pictured) AFP/Getty Timeline of the Isis caliphate Abu Bakr Al-Baghdadi declared the creation of a caliphate in Mosul on 27 June 2014 Timeline of the Isis caliphate Isis conquered the Kurdish towns of Sinjar and Zumar in August 2014, forcing thousands of civilians to flee their homes. Pictured are a group of Yazidi Kurds who have fled Rex Timeline of the Isis caliphate On September 2 2014 Isis released a video depicting the beheading of US journalist Steven Sotloff. On September 13 they released another video showing the execution of British aid worker David Haines Timeline of the Isis caliphate The US launched its first airstrikes against Isis in Syria on 23 September 2014. Here Lt Gen William C Mayville Jnr speaks about the bombing campaign in the wake of the first strikes Getty Timeline of the Isis caliphate Isis militants sit atop a hill planted with their flag in the Syrian town of Kobani on 6 October 2014. They had been advancing on Kobani since mid-September and by now was in control of the city’s entrance and exit points AFP/Getty Timeline of the Isis caliphate Residents of the border village of Alizar keep guard day and night as they wait in fear of mortar fire from Isis who have occupied the nearby city of Kobani Getty Timeline of the Isis caliphate Smoke rises following a US airstrike on Kobani, 28 October 2014 AFP/Getty Timeline of the Isis caliphate YPG fighters raise a flag as they reclaim Kobani on 26 January 2015 VOA Timeline of the Isis caliphate Isis seized the ancient Syrian city of Palmyra on 20 May 2015. This image show the city from above days after its capture by Isis Getty Timeline of the Isis caliphate Kurdish forces are stationed on a hill above the town of Sinjar as smoke rises following US airstrikes on 12 November 2015 AFP/Getty Timeline of the Isis caliphate Kurdish forces enter Sinjar after seizing it from Isis control on 13 November 2015 AFP/Getty Timeline of the Isis caliphate Iraqi government forces make the victory sign as they retake the city of Fallujah from ISIS on 26 June 2016 Getty Timeline of the Isis caliphate Iraqi forces battle with Isis for the city of Mosul on 30 June 2017 AFP/Getty Timeline of the Isis caliphate Members of the Iraqi federal police raise flags in Mosul on 8 July 2017. On the following day, Iraqi prime minister Haider Al Abadi declares victory over Isis in Mosul Getty Timeline of the Isis caliphate Members of Syrian Democratic Forces celebrate in Al-Naim square after taking back the city of Raqqa from Isis. US-backed Syrian forces declare victory over Isis in Raqqa on 20 October 2017 after a four-month long campaign Getty Timeline of the Isis caliphate Female fighters of the Syrian Democratic Forces celebrate in Al-Naim Square after taking back the city of Raqqa from Isis. US-backed Syrian forces declare victory over Isis in Raqqa on 20 October 2017 after a four-month long campaign AFP/Getty Timeline of the Isis caliphate Trucks full of women and children arrive from the last Isis-held areas in Deir ez-Zor, Syria in January 2019 They were among the last civilians to be living in the ISIS caliphate, by this time reduced to just two small villages in Syria’s Deir ez-Zor Richard Hall/The Independent Timeline of the Isis caliphate Zikia Ibrahim, 28, with her two-year-old son and 8-month-old daughter, after fleeing the Isis caliphate, on Saturday 26 January 2019 Richard Hall/The Independent

He added: “As a father I feel compassion for anyone born or brought into a conflict zone. But in considering what actions need to be taken now, I have to think about the safety and security of children living in our country.”

Ms Begum, who is now 19, gave birth to her third child over the weekend. Her other two children died last year from illnesses compounded by malnutrition and poor healthcare and as Isis lost ground.

Her husband, a former Isis soldier who she married within 10 days of arriving in Syria in 2014, was captured by Syrian forces outside the eastern city of Baghouz earlier this year.

Ms Begum has said she now wants to return to the UK, but has also said she doesn’t regret going to Syria.

Speaking to Sky News since giving birth to a son in a refugee camp in northern Syria, Ms Begum said: “I think a lot of people should have sympathy towards me for everything I have been through.

“I didn’t know what I was getting into when I left.

“I was hoping that maybe for the sake of me and my child they’d let me come back. Because I can’t live in this camp forever. It’s not really possible.”

UK can't make runaway Isis bride Shamima Begum 'stateless' says justice secretary David Gauke

Mr Akunjee said the birth of the child had increased the pressure on the government to allow Ms Begum and her child to come into the UK.

“We are now dealing with an innocent baby who we would like to get out of the camp and back to the UK,” he said.

Ms Begum remains a British citizen, and the UK cannot strip her of her citizenship. Jeremy Wright, the culture secretary, said Britain would be legally obliged to allow Ms Begum to return at some stage.

Speaking on the BBC’s Andrew Marr Show, Mr Wright said: “I think it’s clear that if you’re dealing with a British citizen who wants to return to this country – and they’re not a dual citizen, so their only citizenship is British citizenship – then we are obliged at some stage at least to take them back. That doesn’t mean that we can’t put in place the necessary security measures.”

Ms Begum told Sky News she had “just been a housewife” during her four years living under Isis, and the UK had “no evidence” her return could pose a threat.

She said: “They don’t have any evidence against me doing anything dangerous. When I went to Syria I was just a housewife, the entire four years I stayed at home, took care of my husband, took care of my kids. I never did anything. I never made propaganda, I never encouraged people to come to Syria.”

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In a statement released on Friday, Ms Begum’s family in London said her apparent lack of regret for joining Isis should be regarded as the “words of a girl who was groomed at the age of 15”.

They said: “Now we are faced with the situation of knowing that Shamima’s young children have died – children we will never come to know as a family. This is the hardest of news to bear.