The PM’s strategy was left in tatters on Valentine’s Day after more than 50 Brexiteers refused to back a motion of support for her, leaving it to be defeated by 303 votes to 258.
Furious Brexiteers said the motion would effectively rule out Britain leaving without a deal, and destroy our negotiating hand.
But she vowed to push on ahead with her Brexit plans anyway, insisting that fighting to rip up the hated Northern Irish backstop was the only thing Parliament had said they wanted her to do so far.
A Downing Street spokesperson blamed Jeremy Corbyn for “putting partisan considerations ahead of the national interest” and “voting to make No Deal more likely”.
They also noted the “concerns” of Brexiteers who voted the motion down because they thought it would effectively take away the threat of leaving without a deal.
No10 added: “The motion on January 29 remains the only one the House of Commons has passed expressing what it does want – and that is legally binding changes to address concerns about the backstop.
“The Government will continue to pursue this with the EU to ensure we leave on time on March 29.”
A total of 59 Brexit hardliners either abstained or voted against the motion after a meeting of the European Research Group headed by Jacob Rees-Mogg.
And another 10 Tory MPs who back a second referendum refused to back the Government.
The defeat represents the eighth time Mrs May has lost a Commons vote on Brexit and a fresh humiliation as she battles to save her deal.
Critics blasted the PM for not even turning up to see the result of the showdown