British Prime Minister Theresa May won a confidence vote from her party on Wednesday but 117 of her lawmakers said she was no longer the right leader to implement Britain's exit from the European Union.
May had needed 159 votes for the simple majority to win the vote.
The vote was triggered by conservative lawmakers over May's handling of Brexit. Less than four months until the United Kingdom is due to leave on March 29, Brexit is plunged into chaos with options ranging from a potentially disorderly no-deal departure to another referendum that could reverse it.
Speaking outside her Downing Street residence hours before the vote of confidence on her leadership, May said she would battle for her premiership with everything she had.
In a stark warning to Brexit-supporting opponents who instigated the challenge, May said if they toppled her then the EU exit would be delayed and perhaps even stopped.
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In response to the vote, opposition Labour Party leader Jeremy Corbyn said Wednesday night that Britain's parliament needs to regain control of the Brexit process.
"Tonight's vote makes no difference to the lives of our people," Corbyn said in a statement. "She must now bring her dismal deal back to the House of Commons next week so Parliament can take back control."