The Sunday Times claims the Energy Select Committee Chairman Tim Yeo admitted in secret filming that he coached a paying client on how to influence his committee.
Mr Yeo rigorously denies any wrongdoing.
The paper also says he discussed a fee of £7,000 a day to act as a "paid advocate" for a energy company.
Mr Yeo says he did not accept the offer because he realised it was not permitted under House of Commons rules.
He now plans to refer himself to the Parliamentary Standards Committee.
More top news
AC/DC co-founder and ex-guitarist Malcolm Young has died aged 64, his publicist has announced.
Hundreds of volunteers have joined a search looking for missing teenager Gaia Pope.
Soggy for some, sunshine for others