An inquiry into the way prostitution is treated in law led by Keith Vaz should be abandoned following allegations he paid for the services of male escorts, a campaign group has said.
Nordic Model Now (NMN) said the claims, made in the Sunday Mirror, amounted to a conflict of interest.
NMN advocates decriminalising prostitutes themselves and making buying sex a criminal offence.
The group has previously voiced opposition to an interim report by the Home Affairs Select Committee, which is leading the Prostitution Inquiry, over recommendations solicitation and sharing of premises by sex workers should be legalised.
NMN said the inquiry should now be disbanded and reformed with members obliged to declare any history of purchasing sex, as well as a mandatory 50 per cent of members being female.
Mr Vaz has called the report by the Sunday Mirror "deeply troubling".
Prime Minister Theresa May said people must be able to have "confidence" in their politicians when asked about the scandal.Read the full story ›
A "shocking" under-representation of black and minority ethnic people within UK police forces requires "radical action," a committee warns.Read the full story ›
The mass sexual abuse which took place in Rotherham between 1997 and 2013 is "deeply troubling", according to the head of an influential group of MPs.
Home Affairs select committee chairman, Keith Vaz, said MPs wanted to know how this abuse "was allowed to go unchallenged for so long":
The revelations from the Independent Inquiry into Child Sexual Exploitation in Rotherham are deeply troubling. The Committee will be questioning those in positions of authority at the time that these offences were being committed on how the sexual exploitation of children on a horrifying scale was allowed to go unchallenged for so long.
We will also be hearing from Peter Wanless and Richard Whittam QC about progress in their ongoing review of how the Home Office handled historical allegations of child abuse.
MPs have demanded answers from both South Yorkshire Police and the BBC as to how the broadcaster seemed to know about the raid on Sir Cliff Richard's Berkshire home before it happened.
Home Affairs Select Committee chair Keith Vaz has written to both sides asking them to explain themselves.
In the letter, Mr Vaz asks when the BBC first learned of South Yorkshire Police's intention to carry out the raid, how the BBC received this information and if the police force confirmed the time and date of the planned search to the BBC.
He also queries if it is possible that any BBC journalist behaved inappropriately during the handling of the case and asks for a response by Friday August 22.
Depending what the responses are, witnesses from the police and the BBC could be called to give evidence to the committee when they resume in September.
The choice of a former High Court judge to oversee the Government's inquiry into allegations of a cover-up of child sex abuse has been questioned by a prominent MP.
Baroness Butler-Sloss will head a probe into whether alleged abuse by politicians and other powerful figures in institutions during the 1970s to 1990s was swept under the carpet.
Home Affairs Select Committee chairman Keith Vaz expressed his surprise at the appointment, saying that while Lady Butler-Sloss is "distinguished" she is also a member of the House of Lords.
He said: "She is a member of Parliament and is very closely related to a former Lord Chancellor."
In a letter to the Home Secretary, Labour MP Keith Vaz asked for Yashika's deportation to be delayed and said that to do so before her A-level exams would be "needlessly cruel".
Chair of the Home Affairs Select Committee Keith Vaz has written to Home Secretary Theresa May asking her to urgently reconsider the decision to deport Yashika Bageerathi.
Chair of Home Aff cttee @keithvazmp writes to Home Sec asks her to urgently reconsider decision to deport Yashika Bageerathi. Calls it cruel
Mr Vaz said it was "essential" trust between the federation and the public was restored.
However, he empathised with members of the public who felt let down by the police as he expressed some dismay that the "only people not to apologise" for "Plebgate" were the Police Federation.
Romanians landing at Luton Airport were greeted by Home Affairs Select Committee chairman Keith Vaz on the first day of new rules allowing the migrants to work in the UK.
He said he saw no evidence of migrants who have "rushed out and bought tickets" because of the lifting of regulations.
He said that most of the people he met already work in the UK and were "coming back after a holiday".
But he also criticised the government for a "lack of robust estimates" of the number of Romanians and Bulgarians expected to arrive in the UK.