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Lee Rowley (North-East Derbyshire)
Mr Rowley told his regional TV news on November 15 he submitted a letter.
Simon Clarke (Middlesbrough South and East Cleveland)
Mr Clarke initially sent a letter of no confidence and then withdrew it earlier this year, before resubminging it on the publication of the draft deal.
Jacob Rees-Mogg (Somerset North-East)
The chairman of the European Research Group spoke to members of the press outside the gates of Parliament to announce his loss of confidence in the Prime Minister.
Martin Vickers (Cleethorpes)
Mr Vickers handed in his letter after the Chequers deal was agreed in July.
Laurence Robertson (Tewkesbury)
Mr Robertson wrote to Sir Graham following the Chequers deal in the summer, and confirmed last week the letter remains "live".
Andrea Jenkyns (Morley & Outwood)
Ms Jenkyns said she put in her letter as early as June and has been vocal in calling for other Tory MPs to do the same.
Peter Bone (Wellingborough & Rushden)
Mr Bone told Newsnight on November 15 he had submitted his letter.
James Duddridge (Rochford and Southend East)
Told the Press Association at the time of the Conservative conference in September he had handed his letter.
Anne Marie Morris (Newton Abbott)
Ms Morris the Prime Minister is "not going to deliver Brexit" and there was
"no question" the 48 threshold would be reached.
Mr Davies was one of the first to submit a letter, in July.
Andrew Bridgen (North-West Leicestershire)
Mr Bridgen wrote to Sir Graham on July 10, saying the Brexit talks "seem to have deteriorated into a state of complete capitulation".
Adam Holloway (Gravesham)
Mr Holloway announced on November 15 he had handed a letter saying: "You can not have someone leading a mission who does not believe in the mission."
John Whittingdale (Maldon)
Mr Whittingdale said on November 16 he had written to Sir Graham, adding: "The agreement that is being proposed does not deliver in the way that I and many others want to see."
Mark Francois (Rayleigh and Wickford)
Mr Francois submitted his letter on November 16, describing the draft agreement as "truly awful" and complaining the PM had been surrounded throughout the negotiations by "a preetary guard of high pro-EU senior civil servants who never accepted the result of the referendum ".
Ms Caulfield said on November 15 she submitted a letter.
Ben Bradley (Mansfield and Warsop)
Mr Bradley submitted a letter on November 15, saying the proposed deal was "simply not acceptable".
Chris Green (Bolton West & Atherton)
Mr Green said on November 16 he was putting in a letter "with a heavy heart".