Shamima Begum will appeal the government’s decision to strip her of British citizenship at a specialist court hearing on Tuesday.

Ms Begum, now 20, fled her home in Tower Hamlets, east London, in 2015 to join Isis in Syria. She was found living in a refugee camp in February.

At the time she said she wished to return to the UK, despite declaring she did not regret joining Isis.

But Sajid Javid, who was then home secretary, responded by stripping Begum of her citizenship. The former Isis bride’s family have now taken legal action in an attempt to overturn the decision.

The case will be considered during a four-day preliminary hearing before the Special Immigration Appeals Commission (SIAC) starting on Tuesday.

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

Elisabeth Laing, a High Court judge, is expected to consider whether depriving Ms Begum of her citizenship left her stateless.

Under UK law a person can legally have their citizenship revoked but they cannot be made stateless.

Mr Javid stripped the 20-year-old of her status on the grounds her Bangladeshi heritage meant she could claim citizenship there instead.

Tasnime Akunjee, the Begum family’s lawyer, previously told The Independent that she “never had a Bangladeshi passport”.

Bangladesh has also said the former Isis bride is not a citizen and cannot enter the country.

Individuals appealing to SIAC usually remain anonymous, but it is understood Ms Begum has waived her right to anonymity.

She was previously married to Yago Riedijk, an Isis fighter who she said was later arrested and tortured by the jihadist group.

She had two children while living under the caliphate, who both later died.

She gave birth to a third child while in the Al-Hol camp. The baby boy has since also died.

Begum, who was 15 when she left London with Kadiza Sultana and Amira Abase, two other schoolgirls, has claimed that she is struggling with mental health issues.

Kadiza Sultana is believed to have been killed by airstrikes in 2016. It is unclear if Amira Abase is alive.

Mr Javid’s successor, Priti Patel, has also flatly ruled out allowing Ms Begum to return to the UK.

“Our job is to keep our country safe,” she told The Sun last month.

“We don’t need people who have done harm and left our country to be part of a death cult and to perpetuate that ideology.”

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The status of British citizens who travelled to Syria to join Isis has triggered extensive public debate since Begum was found.

At least 60 British children remain trapped in northern Syria, according to Save the Children.