The teenager, who gave birth to a baby boy in a Syria refugee camp on Sunday, had "a right to return" after fleeing the country to support Islamic terrorism in the Middle East, Mr. Corbyn said.
The Home Office sent the teen's family a letter on Tuesday saying it intends to remove her British citizenship, their lawyer said. "I feel like it's a bit unjust on me and my son". It's a bit upsetting and frustrating.
She said: "It's a bit unjust on me and my son".
Begum Wednesday Yago Riedijk, a convicted terrorist from the Netherlands, three weeks after she fled to Syria.
"However", he added "if they do not make an active effort to retain that citizenship, it lapses when they reach the age of 21".
"I don't know how I would be seen as a danger", she said in a recent interview.
"In light of the circumstances of your daughter, the notice of the Home Secretary's decision has been served of file today (19th February), and the order removing her British citizenship has subsequently been made", read the letter, which said Begum has the right to appeal the decision.
Mr Javid said on Wednesday that worldwide law meant Britain could only do this if it did not leave the person stateless, if they were dual nationals or "in some limited circumstances they have the right to citizenship elsewhere".
British-Bangladeshis are automatically eligible for Bangladeshi citizenship if their parents are Bangladeshi nationals, according to Bangladesh's nationality rules.
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Bangladeshi law reportedly includes a right of "citizenship by descent" to anyone with a Bangladeshi parent.
"The government of Bangladesh is deeply concerned that she [Begum] has been erroneously identified as a holder of dual citizenship", Shahrial Alam told the Guardian.
He added that, if approached, the ministry would need to try to verify Begum's Bangladeshi heritage to assess any possible eligibility for citizenship.
Mr Javid has defended his move and insisted he would not leave an individual stateless - which is illegal under worldwide law - after Bangladesh denied she had citizenship there. "So there is no question of her being allowed to enter Bangladesh".
"I don't think they are allowed to do that", she told the BBC after learning of the move. With the Islamic State on the verge of collapse in Syria, Britain and other countries are nearly certainly going to be confronted with more such cases.
"I never did anything unsafe". My family made it sound like it would be a lot easier for me to come back to the United Kingdom when I was speaking to them in Baghouz.
"I heard that other people are being sent back to Britain so I don't know why my case is any different to other people, or is it just because I was on the news four years ago?"
"But when someone turns their back on our fundamental values and supports terror, they don't have an automatic right to return to the UK", Mr Javid said.
He added that Begum's lawyers could still argue that she was now "de facto stateless", because she is in a war zone with no travel documents or access to consular services.
While responding, Begum who is seeking to return to Britain, called the British government move "hard to swallow", the CNN reported.