Sir John Major has urged Tony Blair to intervene so the full records of conversations he had with George Bush leading up to the Iraq War can be released.
The Conservative former Prime Minister warned that withholding the papers would make suspicions “fester and worsen”.
Discussions over which extracts from more than 130 conversations between Mr Blair and the then US President can be included in the long-awaited Chilcot Inquiry report have delayed its publication for a year.
In the current compromise, the inquiry will be able to publish some details of what the Prime Minister said to Mr Bush but not what the President said to him.
Speaking on Radio 4’s Today programme, Sir John said it was a “pity” for papers to be withheld.
He added: “Firstly, they will leave suspicions unresolved and those suspicions will fester and maybe worsen.
“Secondly, in many ways I think 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.”
Sir John said there were “strict rules” that prevented the current Government from intervening and insisted it was down to Labour or Mr Blair to approach the Cabinet Office, which handled the negotiations.
“Mr Blair could, the previous Labour government could, and maybe in their own interests they should think about that because otherwise, as I say, this will fester and I don't think anybody wishes to see that,” he added.
The details of over 200 Cabinet-level discussions on the Iraq war will also be made available for publication or reference by the inquiry.
Campaigners have reacted angrily to the decision to limit the release and branded the move a whitewash.
Tony Blair: A career of controversies
Tony Blair: A career of controversies
1/11 The Tony Blair 'selfie'.. A journalist takes a picture of Kennard Phillips 'Photo Op', depicting Prime Minister Tony Blair taking a 'selfie' in front of an explosion in Iraq, during a press viewing of the exhibition Catalyst: Contemporary Art and War
2/11 Protesters pictured outside the QEII Conference centre in London in 2011 as former British PM Tony Blair give his evidence in the Chilcot Iraq Inquiry
3/11 David Lawley-Wakelin, who disrupted Tony Blair’s testimony at the Leveson Inquiry by bursting into the court
4/11 Blair giving evidence
5/11 Tony Blair visiting troops in Iraq in 2007
6/11 Blair meeting with troops in Basra, Iraq in 2003
7/11 Britain's Prime Minister Tony Blair speaks to British soldiers at Divisional Headquaters in Basra, May 2007
8/11 British Prime Minister Tony Blair eats dinner with British troops in Basra, Iraq, 21 December, 2004
9/11 Syrian president Bashar El Assad during his official visit to the United Kingdom in 2002. Mr Blair tried to engage Mr Garcia in a conversation about Syria. The former Prime Minister made clear he was very much in favour of military intervention last summer.
10/11 Syrian president Bashar El Assad and wife Asma during their official visit to the United Kingdom in 2002. Mr Blair tried to engage Mr Garcia in a conversation about Syria
11/11 Former Prime Minister Tony Blair's signature adorns a program he signed for an Iraq veteran during a reception at the Guildhall in London following the service of commemoration at St Paul's Cathedral honouring UK military and civilian personnel who served in Iraq
Rose Gentle, whose 19-year-old son Gordon was killed in Iraq in June 2004, said she was “sickened” by the decision to publish only selected sections and believed Mr Blair would “walk away from it with a smile on his face”.
“How will the families get to know the truth?” she asked. “We are just shoved aside. We just feel 'What's the point?'”
Mrs Gentle said the limited disclosure would mean the families were "still going to be wondering" about what had actually gone on between Mr Blair and Mr Bush before the invasion.
Andrew Mackinlay, a former Labour MP who was a member of the Foreign Affairs Select Committee, said redacting records would be a “bad day for democracy and justice”.
A Cabinet Office spokesman said that Government was "pleased" an had been reached.
"Resolving this issue has taken longer than originally hoped but these are sensitive issues," he added.
“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.”
The Chilcot Inquiry was announced in 2009 to examine the period leading up to the 2003 invasion of Iraq, the conflict and its aftermath.
Additional reporting by PAReuse content