Former attorney general Dominic Grieve has said he expects the motion ruling out no-deal to pass with a “substantial majority” tonight.
However he added that MPs could not guarantee that a no-deal Brexit wouldn’t happen.
Speaking to talkRADIO’s John Nicolson, the prominent Remain backbencher said he believed the government would now seek an extension to Article 50.
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Mr Grieve said: “I would expect the motion will go through in one form or another saying we don’t wish to leave on March 29 and on that basis the government will go and try to get an extension of Article 50 and will bring forward the necessary statutory instruments to change the withdrawal act.”
Although it is not certain that EU leaders will agree to an extension, Mr Grieve believed there is a “high level of confidence” they would grant one.
“From their point of view they almost certainly don’t want us to crash out, and giving themselves more time to prepare for us crashing out is in their interest as well,” he added.
MPs will vote tonight on a government motion asking whether the House will accept leaving without a deal on March 29.
Earlier today Michael Gove urged MPs to "work across this house and across old divisions to try to seek a consensus."