The UK government will resume Brexit talks with the Labour Party as MPs return to Westminster following the Easter break.
Cabinet ministers, including the PM's defacto deputy, David Lidington, will meet senior opposition figures in an attempt to solve the Brexit impasse.
But the resumption of talks has provoked anger among a number of Tory MPs, with senior backbenchers meeting later to discuss their next move.
Meanwhile, Prime Minister Theresa May will chair a meeting of her cabinet.
Tory MP Nigel Evans, a Brexiteer and critic of Mrs May, told the BBC the government's handling of Brexit had been "frustrating" and that "fresh leadership" was needed.
Senior members of the Conservative backbench 1922 committee, which Mr Evans is a member of, will meet late this afternoon.
He said: "She's reaching out to the Labour Party and Jeremy Corbyn, when she should have been reaching out to the people."
It comes after it emerged that Mrs May faces an unprecedented no-confidence challenge from Tory campaigners.
More than 70 local association chiefs have called for an extraordinary general meeting to discuss her leadership and a non-binding vote is to be held at that National Conservative Convention EGM.
Under party rules, MPs cannot call another no-confidence vote until December 2019.
However, if the grass-roots vote showed a lack of confidence - it could put pressure on the 1922 Committee of Tory MPs to find a way of forcibly removing the PM from office.
Meanwhile, Change UK - the Independent Group, make this look like forlorn hope as they plan to launch its European election campaign in Bristol.
Elsewhere, Nigel Farage's Brexit Party will unveil its candidates in London.