Tories face 'catastrophic split' over Brexit plan
The comments came amid open warfare in the Tory ranks following former foreign secretary Boris Johnson's comparison of the Government's Brexit strategy to placing the UK in a "suicide vest" and handing Brussels the detonator.
Mr Baker, who quit the Government in response to Mrs May's plan to keep the UK in a "common rulebook" with the EU for goods and agriculture, urged the Prime Minister to ditch the policy.
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Hide Ad"If we come out of conference with her hoping to get Chequers through on the back of Labour votes, I think the EU negotiators would probably understand that if that were done, the Tory party would suffer the catastrophic split which thus far we have managed to avoid," he said.
Mr Baker, a former chairman of the influential pro-Brexit European Research Group of Conservatives, urged Mrs May to negotiate a free trade agreement instead of the Chequers plan.
Home Secretary Sajid Javid said a Canada-style deal has a "lot to commend it", but it would not address the problem of the Irish border.
Justice Secretary David Gauke urged the Conservative Party to rally behind Theresa May's Chequers plan for leaving the EU.
"There isn't an alternative credible plan out there. I think that it is absolutely right that the Cabinet and the parliamentary party backs the Prime Minister. In challenging circumstances she is the right person to deliver the right deal for this country."