Dr Blix, who is now 82, is expected to outline his claims of disagreements with Tony Blair and senior officials in the Bush Administration.
Three years ago, in an exclusive interview with Sky News, Dr Blix said the invasion was "clearly illegal" and accused the then Prime Minister of not being completely straight with the evidence used to justify military force.
"They put exclamation marks instead of question marks," he said. "There were question marks but they changed them to exclamation marks."
In 2000, Dr Blix, a former Swedish Foreign Minister, was brought out of retirement by then UN Secretary General Kofi Annan to head Iraq's inspection programme.
Two years later, as the Executive Chairman of the UN Monitoring, Verification and Inspection Commission (UNMOVIC), he led a team of 200 weapons inspectors back into Iraq.
Today he is expected to repeat frustrations first made in his book, entitled Disarming Iraq, at not being able to complete the inspection process.
His team was pulled out of Iraq just before the invasion despite his insistence to the British and Americans that he was experiencing some cooperation from Saddam.
"A UN inspection force of fewer than 200 inspectors costing perhaps $80m per year was pushed out and replaced by an invasion force of some 300,000 personnel costing approximately $80bn per year," he wrote.
In his 2007 interview with Sky News, he claimed war could have been prevented if his team's work had been allowed to continue.
"I think if they'd allowed us to carry on the inspections a couple of months more then we would have been able to go to all the sites suspected of by intelligence," he said.
"And since there weren't any weapons, we'd have come with that answer: there are no weapons at all the sites you've given us."
Dr Blix also used his book to question Mr Blair's judgement, describing a telephone exchange with the former Prime Minister a month before the invasion.
"Part of my conversation... touched on the role and quality of intelligence," he wrote.
"I said that while I appreciated the intelligence we received, I had to note that it had not been all that compelling...
"Blair responded that the intelligence was clear that Saddam had reconstituted his weapons of mass destruction programme.
"Blair clearly relied on the intelligence and was convinced, while my faith in intelligence had been shaken."
The former Prime Minister has since accused Dr Blix of "re-writing history".
Mr Blair told the Inquiry in January: "Hans Blix obviously takes a certain view now. I have to say in my conversations with him then, it was a little different."
He claimed Dr Blix's progress reports to the UN in early 2003 simply confirmed Saddam was never in "full and unconditional compliance".
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