British Prime Minister Tony Blair will not quit after what is set to be his toughest week since coming to power over six years ago, a senior minister said yesterday. Blair's future is in the balance as he braces for a long-awaited judge's report on Wednesday into the role of the government during events leading to the suicide of David Kelly, a British expert on Iraq's weapons of mass destruction. Blair will come under intense scrutiny on Wednesday when a judicial inquiry publishes its findings into the suicide last July of David Kelly. The expert on biological weapons was under pressure after the government allowed his name to emerge as the source of allegations by the BBC that Downing Street "sexed up" intelligence on Iraq and weapons of mass destruction in the run-up to the war launched last March. The controversy, which plunged Blair into his worst crisis as prime minister, was given fresh impetus when David Kay, the top US official hunting for evidence of Saddam Hussein's weapons, stepped down on Friday. Kay was widely quoted by British media as saying he doubted prohibited weapons would ever be found. Speaking to the Observer prior to Kay's resignation, Blair said that he had no doubt that pre-war intelligence about an active Iraqi quest for weapons of mass destruction was "genuine" - but he refused to pledge that such weapons will still be found. Blair, who contributed some 45,000 troops to the US-led war, sought to sell the Iraq campaign to a sceptical British public by warning of the dangers of Saddam's pursuit of banned weapons. **PHOTO CAPTION*** Britain's Prime Minister Tony Blair leaves Downing Street, London, en route to the House of Commons, January, 26, 2004. (REUTERS/Stringer)