Conservative MP Philip Lee has addressed the Liberal Democrats before the Boers riot and Tory rebels over Brexit.
Dr Lee, a Bracknell MP, took his place in opposition benches as the prime minister addressed the municipalities.
Its failure means that Boris Johnson no longer has a working majority in the House of Commons.
He stated that the government was "pursuing harmful Brexit in unscrupulous ways … endangering life and livelihoods".
Mr Johnson vowed to leave the EU on 31
They tabled a contingency debate with Commons Chairman John Bercow, and if they succeed, they will submit a bill that will force the PM to ask for a Brexit postponement until January 31, unless lawmakers approve a new deal or vote in support on a non-negotiable exit deal, until October 19th.
Speaking to municipalities, Mr Johnson told MPs that he was seeking EU exit talks and insisted that there was a 'real time' behind the Brussels talks.
He said he would travel to Dublin on Monday for discussions with Irish Prime Minister Leo Varadkar to focus on proposed alternative arrangements for stopping the Irish border – a key turning point in the negotiations.
Asked to provide evidence of the progress of several Tory MPs, he said he would not negotiate in public but reassured them that he would give details of the UK's proposals long before the end of September to meet the final term set by German Chancellor Angela Merkel.
But he said steps by lawmakers, including conservatives, to pass legislation effectively blocking the exit from the deal on October 31 would "ruin any chance of negotiating a new deal."
If the rebels succeed in their goals, Mr Johnson said he would force him to leave for Brussels to "beg for another senseless delay" on Brexit and he "would never" do so.
"This is Jeremy Corbin's show. That means the white flag is rising," he added.
No. 10 said the prime minister would run for election on October 14 if lawmakers succeed in blocking any deal.
But he asked if he could just ignore them and move on with Brexit without a deal, whether he said, "Of course, we will uphold the constitution and obey the law."
Before Dr. Lee's defect, Mr. Johnson had only a working majority of one in Commons. 19659004] In a letter to the Prime Minister, Dr Lee says Brexit divisions have "unfortunately turned this once great party into something closer to a narrow faction in which one's conservatism is measured by how reckless he wants to leave the European Union. union. "
"Perhaps more disappointingly, he became infected with the twins of English nationalism and populism."
He said that Lim Dem – who supports another Brexit referendum and wants Britain to stay in the EU – is the most better placed to “heal the divisions” and “overcome the challenges we face as a society”.
Welcoming his latest rookie, Lib Dem leader Joe Swinson declared that they would work together to prevent "catastrophic Brexit" that would cause untold damage to the NHS and other public services.
Dr. Lee's decision to cross the floor – following a decision by former Tory MP Sarah Wallstone last month – was met with cheers on opposition benches.
Amid angry exchanges during Prime Minister's statement at last month's G7 summit, Jeremy Corbyn called on the prime minister to "consider his choice of language" to describe the rebels' bill.
The Labor leader said that the UK was "not at war with Europe" and that this was a way out without a deal that would force Britain to "hand over" jobs, employment standards and social protection.
"His is a government without a mandate, morality and to this day without a majority," he added.
SNP leader in Parliament, Ian Blackford, said Dr Lee's defect limited what he said was "the shortest honeymoon period ever" for a new prime minister.
He stated that his party was ready for general elections at any time.
Recently, efforts to introduce Tory rebels have been sidelined, but BBC political editor Laura Quensberg said the meeting between the prime minister and the group had earlier been "less than a swim" and was "less less than heartfelt. "
It is estimated that there are about 15 confirmed rebels.
The government hoped the threat of elections – and the election and exclusion of the party – would be sufficient to bring them into line.
But veteran Tory Ken Clark, one of those who rebelled later, said the Prime Minister's strategy was "to put in place conditions that do not make an inevitable bargain to ensure that as much blame is possible to be associated with the EU and to fight the slaughter of flags as soon as possible before the consequences of a deal become too obvious to the public. "