But if they do, they would plainly chop the legs out from under the United Kingdom position and make any further negotiation impossible.
But leading figures, including ex-cabinet minister David Gauke, have insisted that despite the threat of expulsion, they will press ahead with efforts to pass legislation requiring the PM to seek another Brexit extension if he can not get a deal.
A meeting on Monday between Johnson and key government ministers triggered speculation that he was preparing for early elections.
British Prime Minister Boris Johnson said Monday that he doesn't want an election amid the Brexit crisis and issued a rallying cry to lawmakers to back him in securing a Brexit deal.
"If they vote to give Boris Johnson the chance to do the negotiations. that would be the best chance for Britain to get a deal", the source said. Johnson has a tiny majority in Parliament at the moment and would try to widen it to push through a Brexit deal, as Langfitt reported.
On Monday, the shouts of protesters could be heard in the background as Johnson encouraged lawmakers to vote against a bill aimed at stopping him from crashing out of the European Union without a deal.
Many British MPs are opposed to a "no deal" Brexit, fearing huge economic disruption, but they are running out of time.
In a bid to head off the challenge, Johnson - who has been in office for less than six weeks - warned that MPs from his own party could be expelled if they backed the opposition Labour party's plan to delay Brexit.
Details of the opposition's draft legislation to prevent no-deal emerged on Monday afternoon, in a tweet from opposition Labour Party MP Hilary Benn.
Parliament is expected to vote against the government tomorrow, a move which could severely delay the Brexit process.
"The Bill has cross-party support from MPs who believe that the consequences of No Deal for the economy and the country would be highly damaging". Johnson requires a two-thirds majority of lawmakers in the House of Commons to carry a vote for an election.
According to the BBC, he is planning to introduce a law to force Johnson to seek to delay Brexit until January 1, 2020, unless parliament had approved a divorce deal or accepted a "no deal" Brexit before October 19.
"I know people voted both ways in the referendum, obviously, I know people have different views about these things, obviously, but I simply say this - people didn't vote to lose their jobs, didn't vote to see our environmental standards, workers' rights, consumer protections ripped up".
There is not scheduled to be another general election until 2022.
In this case, that means getting the support of the Labour Party.
An election would open up three main options: a Brexit-supporting government under Johnson, a Labour government led by veteran socialist Jeremy Corbyn or a hung parliament that could lead to a coalition or minority government of some kind.
Mr Corbyn, however, was quoted as saying over the weekend that the fight to stop a no-deal was not a struggle between those who want to leave the European Union and those who want to stay, but rather a battle "of the many against the few who are hijacking the referendum result".
And so I say to show our friends in Brussels that we are united in our objective, MPs should vote with the government against Corbyn's pointless delay.