Labour deputy leader Tom Watson has defended his decision to pass on sex abuse claims against former home secretary Leon Brittan and urged all MPs to "examine their consciences" over the handling of such allegations.
Prime Minister David Cameron earlier said Mr Watson had "a lot of questions to answer" and should "examine his conscience" after Lord Brittan's brother called on him for an apology.
Responding with a statement in the House of Commons, Mr Watson said: "We all need to examine our consciences in this house."
He added: "We've presided over a state of affairs where children have been abused and then ignored, dismissed and then disdained. If anyone deserves an apology, it's them."
Lord Brittan's brother Sir Samuel Brittan has condemned the West Bromwich East MP for passing "unfounded allegations" from a number of alleged victims to the Director of Public Prosecutions (DPP).
Tom Watson offered a scathing assessment of his opening round of 76 in his final appearance in the Open Championship on Thursday.
The 65-year-old five-time champion recovered from hitting his approach to the first into the Swilcan Burn with birdies on the sixth, ninth and 10th, but carded double bogeys on the 13th, 16th and 17th to come home in 41.
"I stunk up the joint today the way I played," said the former Ryder Cup captain, who announced on Wednesday that next year's Masters will also be his last.
"Too many sixes on the back nine ruined my day. I had a little string of birdies going but made some unforced errors coming in... a little bit of brilliance but a bit of ugliness averaged it out.
"When I got it to a couple under par I knew the back nine was going to play a little tougher into the wind and I knew I had to hit some quality shots, and I didn't. That was the disappointment. I didn't follow up some of the good shots I hit in the middle of the round and finish the deal. I failed."
MP Tom Watson has called for Charles Napier to "spill the beans" on his former contacts at the Paedophile Information Exchange (PIE) - a shady group that campaigned to abolish the age of consent in the 1970s.
Watson, who has been instrumental in launching Operation Fairbank, said in a statement today:
Senior MPs on both sides of the green benches for Andrew Mitchell to be reappointed to the Cabinet after a police officer admitting to falsely claiming to have witnessed the 'plebgate' row between the former Chief Whip and officers:
Prominent Labour MP Tom Watson has admitted to an "embarrassing mistake" tonight after voting the wrong way on changes to rules surrounding Fixed Odds Betting Terminals (FOBTs) - an issue he had personally led a campaign on.
In a blog post after the result, Mr Watson admitted this was the worst time to make such a mistake - but insisted it was "bound to happen" at some point in his Commons career.
He said: "I voted the wrong way as my head said put the cross in the 'no' box but my hand put the cross in the 'yes' box.
"On most days few would notice this act of tiny rebellion. Except this was the day in which I made the front page of the Daily Mail, leading the campaign against FOBTs.
Mr Watson was initially even more shocked after first thinking the vote had been lost by only one vote - joking he almost "jumped in the Thames".
An internal report initially found concerns over the selection of a Labour candidate for the 2015 General Election in Falkirk.
After allegations were made that the Unite union was involved in selection-fixing in the constituency, the selection process was postponed and leader Ed Miliband hit out at the union's general secretary Len McCluskey.
It was the ensuing bitter public dispute between the pair that led Mr Miliband to propose reforms to Labour's historic links with the trade unions.
Tom Watson - for whom the Unite-backed candidate Karie Murphy worked - quit as the party's General Election co-ordinator at the height of the dispute.
Earlier this week the GMB union, which supported Mr Miliband's leadership bid, announced it was slashing its affiliation funds to the Labour Party from £1.2 million to £150,000.
The Labour MP Tom Watson, who quit as the party's election co-ordinator during the "media frenzy" over allegations surrounding the selection of the prospective parliamentary candidate for Falkirk, has tweeted:
At the time, the shadow defence secretary said Unite had "well and truly overstepped the mark" in the constituency where there had "clearly been some external interference".
An internal inquiry has said there was no evidence involving Karie Murphy, who works for Mr Watson.
Labour's former General Election co-ordinator Tom Watson has pledged to "fight very hard" to retain the party's links with trade unions after the GMB union announced it was slashing its funding.
Mr Watson, who was involved in the selection of Labour's election candidates, resigned his shadow cabinet position over the Falkirk row.
He wrote on his blog: "If this is the beginning of the end of that historic link, it is a very serious development that threatens a pillar of our democracy that has endured for over one hundred years.
"Some will scoff but they are fools to do so. That party card stands for something more than confirmation that an annual direct debit has been processed."