Patrick Mercer has dramatically resigned from the Conservative Party after being confronted by The Telegraph. 
The Telegraph and the BBC's Panorama have been investigating the former shadow minister over a major lobbying scandal and is poised to publish a series of revelations about Mr Mercer tomorrow.
He was yesterday asked questions over his activities and was expected to be suspended from the Parliamentary Conservative party this evening.
However, the Conservative MP for Newark is thought to have resigned the whip and is poised to make a statement.
Mr Mercer’s resignation initially sparked speculation that he was preparing a challenge to David Cameron’s leadership. The MP has repeatedly criticised the Prime Minister and called for him to be replaced.
He was sacked from the Tory frontbench in March 2007 after he suggested in an interview that being called a “black bastard” was a normal part of life in the armed forces. He added that he had met a lot of “idle and useless” ethnic minority soldiers.
In a statement, Mr Mercer said: "Panorama are planning to broadcast a programme alleging that I have broken Parliamentary rules.
"I am taking legal advice about these allegations - and I have referred myself to the Parliamentary Commissioner for Standards."
"In the meantime, to save my party embarrassment, I have resigned the Conservative Whip and have so informed Sir George Young. I have also decided not to stand at the next general election."
