The British Prime Minister today rounded on the BBC and the Tory leader Mr Michael Howard following the publication of the Hutton report which exonerated his government's actions.
Mr Blair said charges made against him by BBC reporter Mr Andrew Gilligan could not have been more serious, saying: "If true it would have meant that I had misled this House."
Mr Blair said he had been accused of lying in the dossier on Iraqi WMD and lying about the naming of Dr Kelly.
"Allegations made over the last six months "go to the heart of the integrity of Government, our intelligence services and me personally as Prime Minister."
While he admitted there was an "entirely legitimate argument" about the wisdom of going to war in Iraq and whether or not the world was now "a safer and better place".
But that, he said, was "of a completely different order from a charge of deception, of duplicity, of deceit, a charge that I or anyone else deliberately falsified intelligence".
The truth of those allegations "is now found", he said. And he challenged his accusers - including Mr Howard - to retract them.
"The allegation that I or anyone else lied to this House or deliberately misled the country by falsifying intelligence on weapons of mass destruction is itself the real lie.
"And I simply ask that those who made it and those who have repeated it over all these months now withdraw it, fully, openly and clearly".
But Mr Howard said while the Conservatives accepted the conclusions of Lord Hutton, the report showed the 45 minute claim was given undue prominence in the September dossier.
Amid repeated jeering in the House of Commons the Tory leader called for a new independent inquiry into the questions of how Britain went to war in Iraq - which Lord Hutton stated today were outside his terms of reference.
Mr Howard said that the Downing Street meeting chaired by Mr Blair at which it was decided to issue a press release saying that an unnamed civil servant had come forward "led inevitably to the naming of David Kelly".
The Tory leader said that Mr Blair's claim to reporters immediately after news of Dr Kelly's death that he was not responsible for his naming was, at best, "at odds with what Lord Hutton concludes".