Jacob Rees-Mogg has said there is no certainty that Britain will leave the EU on October 31, despite having a Brexiteer Prime Minister.
The newly-appointed House of Commons leader said he was "as confident as anybody can be" that the deadline to leave the bloc would be met, but refused to rule out the possibility of a delay.
"It is the law that we leave and the only means of stopping that without a change of the law or a vote of confidence, is if the Prime Minister himself decides to change the date, and I'm absolutely confident that will not happen," he told talkRADIO's Julia Hartley-Brewer.
"Can I guarantee that there won't be a vote of confidence? No, of course I can't. Nobody can ever do that, but it seems highly unlikely."
Mr Rees-Mogg continued: "All the law that we need to leave on October 31 is in place, so there's no more legislation needed."
Liberal Democrat leader Jo Swinson wrote to Jeremy Corbyn yesterday urging him to table a no-confidence motion in Boris Johnson, after his refusal to rule out suspending Parliament to push through a no-deal Brexit.
In the letter, she branded the Prime Minister "reckless".
She has already tabled a symbolic motion expressing no-confidence in Mr Johnson, but this will not be voted on by MPs.
Mr Corbyn said he plans to table a motion of no-confidence in the Prime Minister “when appropriate to do so”.