Jeremy Corbyn has urged PM Theresa May to call a general election and let the people decide.
In a speech at a manufacturing plant in Wakefield,, the Labour leader said: Let there be no doubt. Theresa Mays deal is a bad deal for our country and Labour will vote against it next week in Parliament.
He added: I say to Theresa May: if you are so confident in your deal, then call that election and let the people decide.
If not, Labour will table a motion of no confidence in the Government at the moment we judge it to have the best chance of success.
Clearly, Labour does not have enough MPs in parliament to win a confidence vote on its own. So, members across the House should vote with us to break the deadlock.
This paralysis cannot continue. Uncertainty is putting peoples jobs and livelihoods at risk.
Mr Corbyn said: If a general election cannot be secured then we will keep all options on the table, including the option of campaigning for a public vote.
But an election must be the priority. It is not only the most practical option, it is also the most democratic option.
It could give the winning party a renewed mandate to negotiate a better deal for Britain and secure support for it in Parliament and across the country.
Defeat for the Governments central policy on Tuesday would be historic. It would not only signal the failure of Theresa Mays premiership but the failure of the Conservative Party as a party of government.
Mr Corbyn said that Labours Brexit plan involved a new customs union with a British say in future trade deals; a strong single market relationship; and a guarantee to keep pace with EU rights and standards.
He added: The alternative deal Labour has proposed is practical and achievable, and clearly has the potential to command majority support in Parliament.
Mr Corbyn said Labour did not endorse or accept a reported offer from the Government to adopt an amendment to protect workplace and environmental rights.
Answering questions following his speech, the Labour leader said his party did not endorse or accept a reported offer from the Government to adopt an amendment to protect workplace and environmental rights.
Asked if he agreed with shadow Brexit secretary Sir Keir Starmer that it may be inevitable that the March 29 date for EU withdrawal would be delayed, Mr Corbyn said a Labour government would need time to carry out a fresh negotiation with the EU.
Quite clearly, moving into office at a period right up against the clock, there would need to be time for that negotiation, said the Labour leader.
What Keir was doing was reflecting the practicalities of how that negotiation would be undertaken.