Prime Minister Theresa May on Wednesday survived a bid by her own MPs to unseat her, securing the support of 200 Conservative colleagues while 117 voted against her.
The British leader overcame the party no-confidence vote after it was triggered by hardline Brexit supporters who despise the deal she struck with the EU last month.
It leaves May weakened but immune from a further internal challenge for a year.
May said after the result that she would get on with her "renewed mission" of taking Britain out of the European Union.
"Following this ballot, we now have to get on with the job of delivering Brexit for the British people and building a better future for this country," May told reporters outside her Downing Street residence.
May said she would seek legal and political assurances from EU leaders on Thursday on the backstop arrangement over the border between EU member state Ireland and the British province of Northern Ireland
Meanwhile, opposition Labour Party leader Jeremy Corbyn said on Wednesday 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."