Theresa May has promised Tory MPs she will stand down if they back her deal.
She told backbench Tories: “I am prepared to leave this job earlier than I intended in order to do what is right for our country and our party.”
The PM said she knew that Tory MPs did not want her to lead the next phase of Brexit negotiations “and I won’t stand in the way of that”.
Boris Johnson has said he will now back the prime minister’s deal, the BBC’s Laura Kuenssberg said.
Mrs May did not name a departure date at a packed meeting of the 1922 committee.
But Laura Kuenssberg said a Tory leadership contest could be expected in May.
Downing Street said it would be a “different ball game” if the deal