More than 100 Conservative MPs have already declared their intention to vote against May's deal.
Mrs May is expected to lose Commons the vote on her withdrawal deal on Tuesday, raising the prospect of a no-deal departure on March 29.
Mrs May has so far refused to retreat from her unpopular deal, which envisages close trading ties with the European Union, but without any say on policy as Britain has now.
Not doing so risks the United Kingdom leaving the European Union with no deal or Brexit not happening at all, she said. The monthly GDP was of 0.2%, better than the previous 0.1%.
During a visit to Romania on Friday, Jean-Claude Juncker, president of the European Commission, said that despite Prime Minister Theresa May's struggles to get the deal through the United Kingdom parliament, he continues to hope she can secure backing for it in Tuesday's vote.
Mr Corbyn has said his party wants to have a general election, a possibility Mr Blackford said the SNP would be prepared for.
Tory MPs including Sir Geoffrey Clifton-Brown and Sir Edward Leigh said they would support the Government in the meaningful vote. If a confidence vote failed, he'd be under pressure to back a second Brexit referendum, risking a backlash from the many Labour supporters who voted to leave the EU.More news: Keane urges Hudson-Odoi to leave Chelsea for Bayern
Vince Cable, leader of the pro-EU Liberal Democrats, said parliament would act to prevent a no deal Brexit, and could ultimately seek to prevent Brexit altogether.
"Clearly, if a general election takes place and a Labour Party government comes in.there would have to be time for those negotiations, ' Corbyn said".
The Cabinet ministers were speaking as MPs prepared for the third day of debate in the House of Commons ahead of next Tuesday's crunch vote, with Home Secretary Sajid Javid opening proceedings which are expected to be dominated by the issue of migration.
She will also go back to the fundamentals of the referendum, observing that during the 2016 campaign, "both sides disagreed on many things, but on one thing they were united: what the British people decided, the politicians would implement".
That could open the way for several different outcomes, ranging from a so-called "managed no-deal" exit to another referendum.
Mrs May faced further opposition to her deal from her former Brexit secretary Dominic Raab.
The Sunday Times reported that rebel lawmakers were planning to wrest control of the legislative agenda away from May next week with a view to suspending or delaying Brexit, citing a senior government source.
Mr Grayling also said: "I have not asked for military support for the operations in Kent - that will be handled by Highways England and Kent Police". A narrower defeat and the bloc may look at fresh ways of making the agreement more palatable to get it across the line in Parliament.