Iraq war

Blair gave strong support to US President George W. Bush's invasion of Iraq in 2003. He soon became the face of international support for the war, often clashing with French President Jacques Chirac, who became the face of international opposition. Widely regarded as a more persuasive speaker than Bush, Blair gave many speeches arguing for the overthrow of Saddam Hussein in the days leading up to the invasion.

Blair's case for war was based on Iraq's alleged possession of weapons of mass destruction and consequent violation of UN resolutions. He was wary of making direct appeals for regime change, since international law does not recognise this as a ground for war. A memorandum from a July 2002 meeting that was leaked in April 2005 showed that Blair believed that the British public would support regime change in the right political context; the document, however, stated that legal grounds for such action were weak. On 24 September 2002 the Government published a dossier based on the intelligence agencies' assessments of Iraq's weapons of mass destruction. Among the items in the dossier was a recently received intelligence report that "the Iraqi military are able to deploy chemical or biological weapons within 45 minutes of an order to do so". A further briefing paper on Iraq's alleged WMDs was issued to journalists in February 2003. This document was discovered to have taken a large part of its text without attribution from a PhD thesis available on the internet. Where the thesis hypothesised about possible WMDs, the Downing Street version presented the ideas as fact. The document subsequently became known as the "Dodgy Dossier".

Forty-six thousand British troops, one-third of the total strength of the British Army, were deployed to assist with the invasion of Iraq. When after the war, no WMDs were found in Iraq, the two dossiers, together with Blair's other pre-war statements, became an issue of considerable controversy. Many Labour Party members, including a number who had supported the war, were among the critics. Successive independent inquiries have found that Blair honestly stated what he believed to be true at the time, though Lord Butler's report did imply that the Government's presentation of the intelligence evidence had been subject to some degree of exaggeration. These findings have not prevented frequent accusations that Blair was deliberately deceitful, and, during the 2005 election campaign, Conservative leader Michael Howard made political capital out of the issue.

Then Secretary General of the United Nations, Kofi Annan, stated in September 2004 that the invasion was "illegal", but did not state the legal basis for this assertion. Prior to the war, the UK Attorney General Lord Goldsmith, who acts as the Government's legal adviser, had advised Blair that the war was legal.

British armed forces were active in southern Iraq to stabilise the country in the run-up to the Iraqi elections of January 2005. In October 2004, the UK government agreed to a request from US forces to send a battalion of the Black Watch regiment to the American sector in order to free up US troops for an assault on Fallujah. The subsequent deployment of the Black Watch was criticised by some in Britain on the grounds that its alleged ultimate purpose was to assist George Bush's re-election in the 2004 US presidential election. As of September 2006, seven thousand and five hundred British forces remain in Southern Iraq, around the city of Basra. After the presidential election, Blair tried to use his relationship with President Bush to persuade the US to devote efforts to resolving the Israeli-Palestinian conflict.

In an interview with David Frost on Al Jazeera in November 2006, Blair appeared to agree with Frost's assessment that the war had been "pretty much of a disaster", although a Downing Street spokesperson denied that this was an accurate reflection of Blair's view.