Clare Short, the former international development secretary, today accused Tony Blair of lying to her and misleading parliament in the build-up to the Iraq invasion.
Short, giving evidence to the Chilcot inquiry into the war, also said that the 2003 conflict had put the world in greater danger of international terrorism.
Declassified letters between Short and Blair released today show she believed that invading Iraq without a second UN resolution would be illegal and there was a significant risk of a humanitarian catastrophe.
She told the inquiry that she had a conversation with Blair in 2002. He told her that he was not planning for war against Iraq and that the evidence has since revealed that he was not telling the truth at that point, she said.
She also said she was "stunned" when she read the 337-word legal advice on the war written by the then-attorney general Lord Goldsmith during a cabinet meeting on 17 March 2003, three days before the war began. She was forbidden by Blair from discussing it during the meeting.