Jeremy Corbyn urged members of all parties to vote on Theresa May's deal and support his "alternative plan" for Brexit, as the activists of the second referendum urged him to "get off the fence" and agree to a renewed public vote.

Labor's leader, who wrote in The Guardian, said that the party's "Comprehensive Customs Union Plan" should be one of the options on the table should the party not be able to force general elections – in addition to a second referendum.

Corbyn argued that if May were defeated next Tuesday, the government would lose "its governing ability." This would have led to an automatic election prior to the introduction of the Temporary Parliaments Act of 2011, which regulated the rules of trust.

"If we do not get a choice under the current rules, all options must be on the table," Corbyn wrote. "That should include Labor's alternative and, as our conference decided in September, the option to promote a public poll to break the bag."

According to Labor sources, recent surveys have shown that the most popular option among the British public was an attempt to renegotiate the Brexit deal, even though the party wants to retain maximum flexibility in a likely chaotic period when May's deal, as usual is expected. voted down

The cautious positioning turned out to be that a head-to-head TV debate between Corbyn and May almost certainly would not take place as Labor and the Tories had not agreed on the exact format. ITV announced that it had given up its plan to broadcast after a similar decision by the BBC.

However, Labor's decision to uphold Brexit's "constructive ambiguity" and support a range of options was accused on Thursday of frustrated second vote campaigns, one of which abandoned its plan to hold a final vote on Thursday for next week.

Sarah Wollaston, a former MP MP, now Tory MP, who had planned to resign a cross-party "doctor's amendment" requesting a second referendum, said she would not do so because she was convinced she was Frontline support without labels at this point would not have been in danger of a serious defeat.

Wollaston said she had made her decision following discussions with the people's referendum campaign, whose active members included many Labor MPs such as Chuka Umunna and Chris Leslie. "Labor must end the constructive ambiguity, Corbyn must get off the fence," Wollaston added.

She said she would act "failed in the House of Commons" after May's deal, even though the Liberal Democrats used Wollaston's decision yesterday to submit their own amendment instead.

The Lib Dem Amendment directs the government to "take all necessary steps to prepare a referendum," although the low number of MPs in the House of Commons means they will not stand a chance next week.

Corbyn says that as part of Labor's "alternative plan" he wants to seek a "comprehensive customs union with the EU and a British say in future trade agreements". He adds that he wants Britain to "have a new and strong relationship with the single market that allows us to trade smoothly" – although time was running out before Britain should leave the EU, in March 2019 it was not clear what the plan would look like should be negotiated.

Corbyn also opposes the unpopular aspects of customs to woo voters pro Brexit and warned that if the UK took it, "workers' rights would fall back" and "state aid to industry would be curtailed". ,

The article appears one day after it emerged that Labor's powerful trade union backer, Len McCluskey, had warned Labor MEPs in a private meeting that they should have reservations about a second referendum.

One in attendance said McCluskey had warned there would be "a sense of betrayal" if the party chose this option, even though the issue is disagreeing at the upper levels of the party. At the weekend it turned out that Sir Keir Starmer, Labor Brexit spokesman, had wanted Labor to reach the point where a second referendum became a viable option.

In September, Labor took a compromise position, in which the party would first decide whether to resist the May treaty. If rejected, try to force a general choice before turning to other options. With the upcoming vote Corbyn and the party leadership come under pressure to find out what could happen next.

Tony Blair, the former PM and activist of the second referendum, returned to Westminster on Thursday, saying that he believes that May's "Half in and Half Out" deal did not satisfy anyone in the Brexit debate and that there was no solution which the majority of votes favored either the lower house.

Speaking at a pressroom pressroom press conference, Blair said that MEPs could be forced to consider a second referendum. "I suspect, and I can be 100% wrong. If all options are chosen, Parliament will come to the conclusion that it really can not be said that it reflects the majority will of the people we need to seek a solution. "

If May's deal is defeated in the Commons on Tuesday, Corbyn may call for a vote of no confidence on Wednesday. Labor, however, desperately tries not to signal his intentions until the last minute.

After the parliament with fixed-term contracts, May will fall if May is defeated with one vote. In 14 days, however, an alternative government can be formed.

Corbyn flies to Lisbon for the two-day congress of the Party of European Socialists on Friday. According to the party, he was expected to meet with Frans Timmermans, a vice-president of the European Commission, the candidate of the socialist parties for the presidency of the Commission, to urge his case.