Remain supporting Tory MP Dominic Grieve has said he will vote to bring down a Boris Johnson government if it means blocking a no-deal Brexit.
Earlier today the Prime Minister announced he would suspend Parliament from the start of September ahead of a Queen's Speech on October 15.
In response the former Attorney General said he would back bringing down the government.
It came as Jeremy Corbyn has written to The Queen after Boris Johnson's scheme to hamper MP's plans to block a no-deal Brexit was revealed.
Commons Speaker John Bercow accusing the Tory leader of a "constitutional outrage"
Speaking on Radio 5Live Mr Grieve : "I don’t see how a Prime Minister who persists with this is going to find he is going to get to the 31 October still in office.
"There will be a vote of no confidence and his government will come down."
He added: "I will certainly bring down a Conservative Government if the Prime Minister persists in following a course of action that is so unconstitutional."
Later he added: "I have always made clear that I want to stop a no-deal Brexit. I will take staged, graded measures to do it," he said.
"I would wish if at all possible to avoid bringing down a Conservative government on a vote of no confidence but if that is what is ultimately took I would be willing to do it.
"I think there are a number of colleagues who have said exactly the same thing."
He said Mr Johnson's announcement was "a reckless act, it's undemocratic and it's unconstitutional".
"Proroguing Parliament for a lengthy period because Parliament is inconvenient is unprecedented in modern times," he said.
He dismissed Downing Street's claim that only four sitting days would be lost: "There wouldn't have been a conference recess because Parliament has already made quite clear it would not vote for a conference recess this year because of the urgency of the situation. And he (Mr Johnson) knew that very well."
In response to the reports of a parliamentary suspension, Tory Party chairman James Cleverley said: "Or to put is another way: Government to hold a Queen's Speech, just as all new governments do."
Read the full story on today's developments here.
