Phillip Schofield, the presenter, has been reported to Ofcom after he confronted David Cameron with a list of suspected paedophiles live on ITV.
David Cameron warned that homosexual men are at risk of being smeared in a "witch-hunt", after he was ambushed by the presenter on This Morning.
The broadcaster is now facing a backlash, after Schofield inadvertently exposed the list of alleged child abusers to millions of viewers during an interview with the Prime Minister.
Rob Wilson, a Tory MP for Reading East, condemned ITV as its "actions could damage innocent people".
Today he wrote to Ofcom, the regulator, asking whether it would investigate allegations that "at least two people's names were visible when Mr Schofield accidentally showed the card to cameras"
Jonathan Dimbleby, a fellow presenter, described Mr Schofield's behaviour as "cretinous".
Last night, Downing Street warned that innocent men are now at risk of being smeared in "trial by Twitter", amid a spate of inquiries into alleged abuse by a Tory grandee, Jimmy Savile and other celebrities.
The Prime Minister's official spokesman called for caution, saying "people shouldn't throw accusations around and smear people".
"There are lots of accusations flying round and many accusations on the internet. We need to be very careful," he said.
"People need to be cautious of the fact that naming names could have implications for future criminal prosecutions."
Sources said Mr Cameron was unhappy about ITV's "silly stunt" and his aides feel the issue was "badly handled".
During the uncomfortable interview, the Prime Minister did not look at the list, which Mr Schofield had compiled from the internet "in about three minutes".
Mr Cameron has already promised a number of inquiries into "truly dreadful" allegations of child abuse in recent weeks, including claims that a senior Tory figure raped a boy of 13 in north Wales in the 1970s.
However, he cautioned against getting carried away in a rush to identify new abusers.
"I've heard all sorts of names being banded around and what then tends to happen is, of course, everyone sits around and speculates about people. Some of whom are alive, some of whom are dead," he told This Morning.
"I do think it's very important that anyone who's got any information about any paedophile no matter how high up in the country or whether they are alive or dead, go to the police.
"There is a danger, if we're not careful, that this can turn into a sort of witch-hunt, particularly against people who are gay."
Mr Schofield later apologised, saying he would never have been involved in any kind of witch hunt.
"If any viewer was able to identify anyone listed, I would like to apologise and stress that was never my intention," he said.
"I was not accusing anyone of anything and it is essential that it is understood that I would never be part of any kind of witch hunt.
"Unfortunately there may have been a misjudged camera angle for a split second as I showed the Prime Minister some information I had obtained from the internet."
Mr Cameron's apparent association of homosexuals with child abuse also drew criticism on social networking websites. However, Downing Street insisted he meant no offence and was referring to the nature of specific internet rumours.
Amid the furore over the list of suspects, William Hague, the Foreign Secretary, repeated promises to leave "no stone unturned" in the hunt for the truth about the scale of child abuse.
He has been accused by one of the alleged victims of "stifling" a previous inquiry into the North Wales abuse by making its remit too narrow.
"It is very, very important that we do everything possible to get to the truth about these matters," he told ITV News. "It's really of huge importance, that's why I ordered an inquiry back in 1996 and I
strongly support what the Home Secretary has announced this week.
"If there's anything more to look at it must be looked at. Really,
there must be no stone unturned in these matters. So, I welcome what
the Home Secretary has announced and let's make sure that anything
that can be discovered, any additional fact that can discovered is