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A lawyer for the family of Shamima Begum, who left London four years ago while still a minor to join the Islamic State group, says the U.K. government plans to revoke her British citizenship.

Attorney Tasnime Akunjee tweeted Tuesday that the family is "very disappointed with the Home Office's intention to have an order made depriving Shamima of her citizenship."

He said the family is "considering all legal avenues to challenge this decision."

Begum ran away with two friends in 2015, when she was 15, and traveled to Syria. Now 19, she says she has given birth to a baby and wants to come home.

The case has reignited a debate in the U.K. about how to deal with citizens who joined IS but now want to return.

The Home Office declined to comment.