The Conservative chief whip will meet leaders of the backbenchers 1922 committee amid growing anger among its executive over the way his outburst at police has dominated the headlines in recent weeks. Mr Mitchell is facing calls to quit after repeatedly refusing to disclose exactly what he recalls saying to police officers who stopped him cycling through the main gates to Downing Street. It was alleged that he called police “f****** plebs” and “morons” but Mr Mitchell has denied using “the words attributed” to him. He stayed away from the Conservative Party conference in Birmingham last week despite being the party’s only MP in the area, but this failed to quell speculation over his future. On Wednesday, Mr Mitchell faces the toughest test of his authority since the row erupted. He is certain to be barracked by Labour MPs during Prime Minister’s Questions and will also meet senior backbenchers to hear the mood among his Conservative colleagues. The “1922 Committee” of Conservative MPs will meet to discuss any concerns they have over Mr Mitchell, and other issues, on Wednesday. One senior MP said that a delegation from the committee would then meet with Mr Mitchell to relay details from the meeting. “He is not a credible figure,” the MP said. “He is doing so much reputational damage to the party and to David Cameron." However, it will be “difficult” for Cameron to sack Mr Mitchell after refusing to do so for so long. “We are not happy with Andrew Mitchell. Locally, everybody is asking questions: ‘Why is this guy still in a job?’ The ’22 is there for backbenchers to raise anything and everything. “There are a lot who are still talking about Andrew Mitchell and who are cross.” Should Andrew Mitchell step down? Yes No Vote View Results Graham Brady, the chairman of the 1922 Committee, may also be asked to raise backbench concerns over Mr Mitchell with the Prime Minister during their regular discussions. However, up to 10 ministers, including two in the Cabinet, believe he cannot continue in his post as chief whip, responsible for enforcing discipline among Tory MPs. One Cabinet minister said Mr Mitchell’s position was “completely undermined” while another said it would be better if he quit “sooner rather than later”. Parliament returns this week giving MPs their first opportunity to express their concerns directly to Mr Mitchell since the controversy. Mr Mitchell met representatives from his local police forces in his Sutton Coldfield constituency on Friday in an attempt to clear the air. But he declined once again to disclose exactly what he remembers saying during the row, insisting only that he did not use the language that had been reported. The Police Federation have said that Mr Mitchell may be called to give evidence to Scotland Yard because he is implying that the Downing Street officers made “a false report”. An investigation should take place into allegations of wrongdoing by the police, the Federation argued. However, senior Conservatives rallied to Mr Mitchell’s defence yesterday, accusing the Police Federation of attempting to use the controversy to damage the government in retaliation for public spending cuts. Chris Grayling, the Justice Secretary, said it was time to move on from the row claimed it was "a mistake" for the Police Federation to "try to use this in the way they are". “It’s clearly very unfortunate, what happened in the first place, with Andrew in Downing Street,” he said. “It was very unfortunate, his conduct was unacceptable, he’s accepted that. He’s apologised. I think really the matter should be left there. “I think it’s a mistake for the Police Federation to be trying to use this in the way that they are.” Grant Shapps, the Conservative Party Chairman, said Mr Mitchell was wrong to have been rude to the police, but claimed he had not received a single complaint about the chief whip from “a single MP”. “Clearly he shouldn’t have been rude,” he said. “It’s time to draw a line and move on.” - Winckel