Boris Johnson is among those expected to run for leadership of the Conservative Party if Theresa May resigns Getty

MPs are lining up to sack Theresa May if her Brexit deal is rejected on Tuesday. Labour is seeking to join forces with rebel Tories and the Democratic Unionist Party to bring the prime minister down by voting against her leadership.

Although the vote would not be binding it would place enormous pressure on Mrs May to resign. Conservative MPs reported “febrile” communications yesterday from those jockeying for position before a potential contest. Among those expected to run are Boris Johnson, Dominic Raab, Amber Rudd, Liz Truss, Sajid Javid, Jeremy Hunt and Michael Gove.

In a sign of ebbing cabinet confidence that Mrs May can win Tuesday’s vote, Ms Rudd today becomes the first cabinet minister to break the taboo of discussing a “Plan B”…