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British Prime Minister Theresa May is hunkered down with close allies as she considers whether to give in to relentless pressure to resign, or fight on to save her Brexit plan and her premiership.

May's fate looked sealed on Thursday after the resignation of Cabinet minister Andrea Leadsom, who quit saying she could not support the EU withdrawal bill that May plans to introduce to Parliament.

Conservative lawmakers want May to agree Friday that she will quit. If not, they are likely to try to topple her.

Lawmakers have already rejected May's divorce deal with EU three times, and Britain's long-scheduled departure date of March 29 passed with the country still in the bloc.

Many Conservatives blame May for the delay, and believe she is now an obstacle to Brexit.