Britain's Prime Minister Theresa May addresses the media outside 10 Downing Street after it was announced that the Conservative Party will hold a vote of no confidence in her leadership, in London, Britain, December 12, 2018. REUTERS/Peter Nicholls

LONDON (Reuters) - British Prime Minister Theresa May has canceled a meeting of her cabinet of senior ministers which had been scheduled for later on Wednesday, her office said in a statement.

Earlier, May vowed to fight a challenge to her leadership of the Conservative Party, saying a change now would delay or even imperil Britain’s planned divorce from the European Union.