Jeremy Corbyn is "in denial" about the extent of anti-Semitism within the Labour Party, Conservative MP Tim Loughton has said.
Mr Loughton, the acting chair of the Home Affairs Select Committee, suggested the Labour leader is not doing enough to challenge anti-Semitism within Labour.
Speaking on the BBC's Andrew Marr Show, Mr Loughton said: "We pay tribute to Jeremy Corbyn's long and proud record of fighting racism over many, many years - that is not in doubt.
"What we do question is his leadership in actually doing something serious about this emerging problem of anti-Semitism. Up to 50 members of the Labour Party have been suspended over the last year on his watch."
Mr Loughton added that Labour's "mismanagement" of its alleged anti-Semitism problem has "created an air of it being safe for these anti-Semites within the Labour Party to operate".
A Conservative MP has called on the Crown Prosecution Service to drop the case against Ashya King's parents by the end of the day.
Tim Loughton, MP for East Worthing and Shoreham, called the case "the worst type of officaldom" and added that the treatment of the five-year-old's parents was "offensive", in a blog posted on his website.
Time Loughton, the Conservative former children's minister, told the BBC Radio 4 Today programme that Sharon Shoesmith's payout was "effectively rewarding failure".
A former Conservative education minister has allegedlysuggested that the Lib Dem MP Sarah Teather was a poor families minister because she has no children.
The Daily Telegraph reports that Tim Loughton said Miss Teather, who has no children, failed to support married couples in office because she “doesn’t really believe in family”.
Mr Loughton, who was speaking to activists at the Conservative Renewal conference in Windsor, said: "The person who was actually in charge of family policy amongst the ministerial team at the DfE [Department for Education] was Sarah Teather.
"Which was a bit difficult because she doesn't really believe in family. She certainly didn't produce one of her own. So it became a bit of a family-free zone. I think that is a huge disappointment."
Mr Loughton has since tweeted that his words had been "distorted" by journalists, and were "not a personal attack" on Miss Teather.
The MP said he was "sorry" and his criticism was "not intended or fair" and was meant to be of Lib Dem family policy rather than of Miss Teather.
Tory MP Tim Loughton has said he believes around 139 Conservative MPs voted against the same sex marriage bill, and possibly as many as 40 of them abstained.
If true, that would mean that a substantial majority of the party did not vote with the Prime Minister.
He told BBC News that he did not see it as a reflection on David Cameron's lack of authority.
The Education Secretary Michael Gove has denied any knowledge of who in his department described an outgoing minister as a"lazy, incompetent narcissist obsessed only with self-promotion".
Tim Loughton, who was sacked as children's minister in the last reshuffle, was denounced in a briefing to the Spectator magazine by an anonymous source in Department for Education.
Mr Gove insisted he did not know who made the briefing and said Mr Loughton "far from being incompetent ... was a talented and effective minister who made a difference".