The arithmetic meant it was always going to be hard for the government to defeat a motion supported by a large group of MPs from many parties opposed to a no-deal Brexit.
Members of Johnson's own Conservative party are preparing to join opposition lawmakers to try to force a delay to Britain's exit from the European Union if he can not secure a divorce deal with Brussels in the next few weeks.
If lawmakers are granted control of the parliamentary business, they will seek on Wednesday to pass a law that would force Johnson to ask the European Union to delay Brexit for three months until January 31, 2020 unless he has a deal approved by parliament, or parliament agrees to a no-deal Brexit.
This "rebel alliance" agrees with a cross-section of MPs that a no-deal Brexit would cause economic chaos.
Such are the bitter divisions in the Conservative Party that they did this despite facing the threat of being barred from running for the party in future elections.
Around 15 Conservative MPs said they would vote against their own government, including Winston Churchill's grandson Nicholas Soames.
"We are leaving on October 31, no ifs or buts", Johnson said in a statement outside 10 Downing Street, his official residence, on Monday. "But the lingering doubt they've got is: Will the shenanigans in Parliament somehow lead to the cancellation or the delay of Brexit?"
On a day of high drama, an Edinburgh court also heard a legal challenge against Mr Johnson's decision to suspend parliament next week for more than a month, which critics said was a bid to silence MPs.
He said: "I don't want an election but if MPs vote tomorrow to stop negotiations and to compel another pointless delay to Brexit potentially for years then that would be the only way to resolve this".
So where does the election come in?
The PM said the move would "chop the legs off" the government's negotiating strategy, and warned he will never ask Brussels for an extension to the Halloween deadline.
Johnson is trying to circumvent that by leading them to believe that an election date is set for 14 October but rebel/opposition lawmakers are skeptical that he will change the election date to after 31 October - or in other words, after the United Kingdom has left without a deal.
"What Boris Johnson was doing was essentially threatening people".
Just as Johnson began speaking, he lost his working majority in parliament when one of his own Conservative lawmakers, Phillip Lee, crossed the floor of the House of Commons to join the pro-EU Liberal Democrats. We talked about numbers.
The leader of the Brexit Party said he was ready to put "country before party" and "help in any way we can" if a snap poll is triggered.
Mr Baker has taken over as ERG chairman from Jacob Rees-Mogg who was made Commons Leader when Mr Johnson became Prime Minister.
Some Westminster watchers believe that Mr Johnson actually doesn't want an early election at all.
The issue that he faces though is that he would need two-thirds majority (434/650 votes) to succeed but as mentioned before, Labour lawmakers are not entirely keen on the matter as there is no fail-safe in play to avoid a no-deal.
Johnson's aides insist any election would be held before Brexit, but some of his opponents fear he could change the date at the last minute to after October 31.
Former editor-in-chief of Human Events and Breitbart News London Raheem Kassam told Salon by email that "the defection of Lee and possible defections of others have been an entirely foreseeable eventuality of Johnson's firmer stance on Brexit than his predecessor Theresa May's".