John Bercow has been warned by senior Government figures that “history will judge him” if he snubs a backbench amendment on Tuesday that could save Theresa May's Brexit deal.

The Speaker of the House of Commons will sit down at Tuesday lunchtime to examine a series of amendments tabled which could radically change the course of Brexit.

On Monday night Theresa May, the Prime Minister, told Tory MPs her Government would back an amendment tabled by senior backbencher Sir Graham Brady which says MPs will support her deal if the backstop is swapped for “alternative arrangements”.

Sir Graham’s plan, if agreed by a majority of MPs, would provide Mrs May with evidence to take to Brussels to show the EU a deal is within reach if the bloc is willing to drop its opposition to renegotiating the Withdrawal Agreement. However, Sir Graham’s plan will only be put to a vote if Mr Bercow selects it from a list of 12 amendments which he will allow to be put to a vote at 7pm.

A senior Government source told The Telegraph: “History will judge him, there’s a range of amendments down on both sides of the debate and these should be represented in the selection he makes.