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The Conservative MP for the Wyre Forest Mark Garnier says the departure of three of his colleagues today have made a general election more likely.
He pointed out that his party no longer has a majority in Parliament, even with the support of the DUP, and said "it certainly tips the balance".
Other Conservative MPs have also been reacting to the announcements.
The Shrewsbury MP Daniel Kawczynski's called on the three Conservative MPs who've left the party to "immediately call a by-election".
Mark Pritchard, the MP for The Wrekin, says the resignations are "disappointing but not a surprise" and Ludlow's Philip Dunne said he "regrets" their decision.
MPs are expected to discuss the government's response to allegations of inappropriate behaviour at Westminster, following allegations made against the Wyre Forest MP Mark Garnier.
His former secretary Caroline Edmondson told the Mail on Sunday newspaper that he called her "sugar tits" and had sent her to buy him sex toys when she was working for him.
Fellow Conservative Rachel Maclean, MP for Redditch, said there needs to be more focus on allowing Parliamentarians to raise concerns about the behaviour of others.
Mr Garnier has denied the claims constitute harassment and described the incident as "good humoured high jinks".
International trade minister Mark Garnier says that he was part of "project fear" opposing Brexit during the EU referendum.