Leader of the House Lord Strathclyde repeated a statement on a report into the 1989 murder of Belfast solicitor Pat Finucane, on 12 December 2012.
The statement, made earlier in the Commons by Prime Minister David Cameron, came on the day that a review for the government by Sir Desmond de Silva QC reported its findings.
David Cameron told MPs the report makes for "extremely difficult" reading.
He said the review by Sir Desmond de Silva QC found "no overarching state conspiracy to murder Pat Finucane" but "shocking levels of state collusion".
Mr Finucane was shot by loyalist paramilitaries in front of his wife and children at his north Belfast home in February 1989.
The defence solicitor's clients had included IRA hunger strikers and families involved in shoot-to-kill allegations against the police.
The report found no evidence that any government minister had "fore-knowledge" of Mr Finucane's murder or knew about the subsequent cover-up.