Tony Blair could intervene to ensure exchanges he had with George Bush in the run-up to the Iraq war are fully disclosed, Sir John Major has said.
The Chilcot Inquiry, which is looking into the decision to go to war, has reached a deal to publish the "gists" of the two leaders' communications.
But the Conservative former prime minister urged Mr Blair and Labour to consider giving permission for full disclosure, warning that revealing only partial extracts would allow suspicions about what took place to "fester and maybe worsen".
Sir John said there were "strict rules" preventing the current Government from getting involved, but that "withholding them is going to be very embarrassing for Tony Blair, not least of course because he brought the Freedom of Information Act into law when he was in government."
Former Prime Minister Sir John Major has said the decision to withhold some of the correspondence about the Iraq war will be "very embarrassing" for Tony Blair.
Sir John Major told Radio 4's Today programme: “I think it is a pity the papers are going to be withheld for several reasons. Firstly, they will leave suspicions unresolved and those suspicions will fester and maybe worsen."
He also argued that the ruling ran counter to Mr Blair's actions to make government more transparent.
"And secondly, in many ways I think withholding them is going to be very embarrassing for Mr Blair, not least of course because he brought in the Freedom of Information Act into law when he was in government."
The government says it is "doing everything it can" to ensure the Chilcot Inquiry is able to publish its long-awaited report into the Iraq report quickly, after a deal was finally reached to disclose the "gists" of conversations between George W Bush and Tony Blair.
Resolving this issue has taken longer than originally hoped but these are sensitive issues [...]
The Government and the Inquiry are working to ensure the Inquiry's report is published as soon as possible and the Government is doing everything it can to facilitate that.
An agreement has been reached over disclosing sensitive documents detailing discussions between Tony Blair and George Bush over Iraq.
Sir Jeremy Heywood, the Government's most senior civil servant, who was principal private secretary to Mr Blair in 10 Downing Street in the run-up to the war, has agreed the principles of handing over the "gists and quotes" of correspondence between the two former leaders.
Under review will be 25 notes from Mr Blair to Mr Bush and more than 130 records of conversations between the former Prime Minister and then US president.
In a letter to Sir Jeremy, Sir John Chilcot, the head of the Iraq inquiry, said "the use of direct quotation from the documents should be the minimum necessary".
The former Foreign Secretary David Miliband has told ITV's The Agenda that "George Bush was the worst thing ever to happen to Tony Blair."
Speaking a fortnight before the 10th anniversary of the start of the Iraq war, he said: "Before I became an MP I worked for Tony Blair in Downing Street and I watched him with President Clinton and I watched him go through the agony before the intervention in Kosovo, which saved a lot of lives.
"There's no question in my mind that if you compare that to the post 2001 period George Bush was the worst thing ever to happen to Tony Blair if I contrast those two relationships with one American President and with the next.
"Because the first term of the Bush administration took America and the world on a very different course than had been set in the post Cold War period."
The Agenda with Tom Bradby is on ITV at 10.35pm.
You can join in the debate on Twitter by using the hashtag #TheAgenda
Organisers of a conference in the Cayman Islands claim they are forbidden from releasing details of a speech former President George W. Bush will make at the event.
The former president's keynote speech is also "totally closed to journalists", Dan Kneipp, a spokesman for the Cayman Alternative Investment Summit, told the Associated Press, adding, "We've got a complete blackout on discussing the Bush details".