Jeremy Corbyn has criticised Sajid Javid’s decision to revoke Shamima Begum’s citizenship, saying that she has a right to return to the UK.
The Home Secretary made the move after the teenager, who fled the UK aged 15 to join IS, said she wanted to return to the UK.
Mr Corbyn said: "She obviously has, in my view, a right to return to Britain.
"On that return she must obviously face a lot of questions about everything she has done and at that point any action may or may not be taken.
"But I think the idea of stripping somebody of their citizenship when they were born in Britain is a very extreme manoeuvre indeed.
"Indeed, I questioned the right of the Home Secretary to have these powers when the original law was brought in by Theresa May when she was home secretary."
'Safety and security'
A Home Office spokesman said Mr Javid's priority was the "safety and security" of the country, after Bangladesh denied she had citizenship there.
A statement from Bangladesh’s foreign affairs minister Shahriar Alam said Begum would not be allowed to enter the country.
The Begum family’s lawyer Tasnime Akunjee said he is preparing an appeal, and that Begum was born in the UK and has never had a Bangladeshi passport.
Mr Javid has suggested that Begum’s baby, which was born on Sunday, may be able to come to the UK.
He told the House of Commons: "If a parent does lose their British citizenship, it does not affect the rights of their child.”