Prime Minister Theresa May is making a last-ditch attempt to persuade MPs to back her Brexit deal as Tuesday’s key Commons vote looms closer.
She will use a speech on Monday to warn that Parliament is more likely to block Brexit than let the UK leave with no deal.
Mrs May will add that trust in politics will suffer “catastrophic harm” if the referendum result is not implemented.
Labour has vowed to table a vote of no confidence if Mrs May loses.
Its leader Jeremy Corbyn said Labour would vote against the deal and would start moves to trigger a general election if it is voted down.
He told newsmen “We will table a motion of no confidence in the government at a time of our choosing, but it’s going to be soon, don’t worry about it.”
Mrs May’s speech comes amid reports MPs plan to take control of Brexit if her deal is defeated.
About 100 Conservative MPs, and the Democratic Unionist Party’s 10 MPs, are currently expected to join Labour and the other opposition parties in voting against the deal.