A Tory MP has dealt a catastrophic blow to Theresa May after announcing he could vote no confidence in her government.
Hard Brexiteer Steve Baker said the prospect of joining Jeremy Corbyn in a no-confidence vote is "on the table" if Mrs May backs a softer Brexit .
Mr Baker is one of around 30 Leave-backing Tory 'Spartans' who have refused to back down and support the Prime Minister's deal.
And yesterday he warned the Conservative Party faces the biggest split since the Corn Laws 173 years ago if Mrs May pivots to a softer Brexit.
It comes as MPs hold "indicative votes" on Brexit tonight which are expected to pitch the Prime Minister towards backing a customs union with the EU.
Mr Baker told BBC Politics Live: "At this point I can foresee no circumstances while as a Conservative MP I voted against the government in a confidence motion.
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"But we are approaching the point where the stakes are now so very high and so transcend party politics and what this country is about, and the fundamental British value that political power rests on consent, that I think these things are coming onto the table."
Mr Baker said he was trying to "save" the party, adding of a no confidence vote: "It's on the table. There's no point denying things are running away."
Jeremy Corbyn forced a no confidence vote in the government in January but it was defeated by 19 votes in the House of Commons.
Since then Labour's leader has repeatedly threatened a re-run, but has held back until he is sure he can win enough support.
If Theresa May's government were to lose a no confidence vote, it would have 14 days to regain MPs' support - or an election is triggered automatically.
There has been speculation that Tory hard Brexiteers could vote no confidence in the government to oust Mrs May, but then restore their confidence in the government days later under a new, interim Tory leader.
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Mr Baker has less to lose as he becomes increasingly isolated from the core of the Tory party over Brexit.
Theresa May has slowly managed to whittle down 118 Brexit rebels to 34 in three votes on her Brexit plan.
Mr Baker was one of the MPs who refused to budge last week despite Boris Johnson and Jacob Rees-Mogg finally rowing in behind the PM.
Last week he told Tory MPs he wanted to "tear down Parliament and bulldoze it into the river" in a furious meeting over the PM's plan.
In an emotionally-charged meeting on Wednesday he said: "These fools and knaves and cowards are voting on things they don’t even understand.
"We’ve been put in this place by people whose addiction to power without responsibility has led them to put the choice of No Brexit or this deal.
"I may yet resign the whip than be part of this."
