Corbyn's Labour Party outperformed expectations in this month's election, turning what was predicted to be a procession for May into a disaster, severely weakening her authority as Britain kicks off crucial Brexit talks.

Corbyn told the left-wing newspaper the Daily Mirror that it was "ludicrous" to believe the Conservatives' minority government could survive, and that his party "will challenge this government at every step and try to force an early general election."

A poll for the paper asking the public who would make the best prime minister has put Corbyn ahead for the first time, although other surveys have revealed little appetite for another vote after two tumultuous years for British voters.

May's party is currently in negotiations with Northern Ireland's DUP to secure an informal parliamentary deal that would give it an effective majority.

MPs will vote on May's legislative agenda next week, and opposition parties have vowed to block her programme in what is traditionally seen as a test of confidence in the government.

Members of May's own party are reportedly lined up to dump their leader if it looks like her government will lose the vote.