Iraq inquiry: Jack Straw dismissed legal advice on 'illegal' invasion
Sir Michael said he had considered resigning on the eve of the invasion in March 2003 in protest at the decision to join the US-led attack.
He described how he was sidelined after he made clear his objections to military action.
His evidence intensifies the pressure on Tony Blair, who is due to give evidence to the Iraq Inquiry on Friday.
Sir Michael rejected the Government's argument that United Nations Security Council resolution 1441 - passed in November 2002 - requiring Saddam Hussein to disarm was a sufficient basis for military action.
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He described how he was sidelined after he made clear his objections to military action.
His evidence intensifies the pressure on Tony Blair, who is due to give evidence to the Iraq Inquiry on Friday.
Sir Michael rejected the Government's argument that United Nations Security Council resolution 1441 - passed in November 2002 - requiring Saddam Hussein to disarm was a sufficient basis for military action.