"Of course you can't say those of us who removed Saddam in 2003 bear no responsibility for the situation in 2015."
Scottish First Minister Nicola Sturgeon accused the ex-PM of starting to prepare the ground for expected criticisms when the long-delayed report of the Chilcot Inquiry is finally published.
"The Blair spin operation begins but the country still awaits the truth," the Scottish National Party leader posted on Twitter.
"The delay to Chilcot report is a scandal."
No date has yet been given for the release of the final conclusions - more than six years after the inquiry was set up by then prime minister Gordon Brown with an assurance it would take a year.
The process was severely delayed by a process known as "Maxwellisation", under which those who may face criticism - believed to include Mr Blair - are given the opportunity to respond before publication.
Relatives of soldiers killed in the conflict have threatened legal action if a date is not fixed soon.
A spokeswoman for the former PM said: "Tony Blair has always apologised for the intelligence being wrong and for mistakes in planning. He has always also said, and says again here, that he does not however think it was wrong to remove Saddam.
Lord Blunkett - who was home secretary at the time of the decision to join the military action - said he had sought assurances in vain from Mr Blair over the planning for the aftermath.
"Tony was not able to say what was going to happen when combat operations were over. He just decided to trust Cheney and Rumsfeld," he told the Mail on Sunday - referring to the then US vice president and defence secretary.
If Sir John Chilcot did not quickly release an interim copy of his findings, he would "risk his entire exercise being entirely discredited", he added.
- PA