Britain's Prime Minister Tony Blair addresses supporters at Trimdon Labour Club, in his Sedgefield constituency in Trimdon, England.
TRIMDON, England Prime Minister Tony Blair said today that he will step down as prime minister on June 27, after a decade in office in which he brokered peace in Northern Ireland and followed the United States to war in Afghanistan and Iraq.
Surveying his time in power, Blair, 54, told supporters: "Hand on heart, I did what I thought was right."
Following the Sept. 11, 2001, terrorist attacks in the U.S., it was right, Blair said, to "stand shoulder to shoulder with our oldest ally, and I did so out of belief."
"And so Afghanistan, and then Iraq the latter bitterly controversial.
"And removing Saddam and his sons from power, as with removing the Taliban, was over with relative ease. But the blowback since, with global terrorism and those elements that support it, has been fierce and unrelenting and costly.
"And for many it simply isn't and can't be worth it. For me, I think we must see it through."
In a short, almost apologetic speech, Blair added: "I may have been wrong. That's your call."
Treasury chief Gordon Brown, Blair's partner in reforming the Labour Party and a sometimes impatient rival in government, was expected to easily win election a the party's new leader and become the next prime minister.
Blair's announcement is one that his Labour Party, and the nation, have been expecting for nearly three years, ever since the prime minister said in 2004 that his third term would be his last.
"Today, the beginning of the end," read the front page of The Guardian newspaper.
Blair met earlier with Cabinet members, who left No. 10 Downing Street without answering questions shouted by reporters swarming outside.
Brown has already declared he will be a candidate; at least one opponent from the party's left wing was expected to announce his candidacy Thursday afternoon.
John Burton, Blair's political representative in the northern parliamentary district of Sedgefield, said earlier that Blair would continue to represent Sedgefield in Parliament until the next national election, expected in 2009, unless he is offered "a major international or United Nations job."
The Iraq war, a police investigation of allegations that the government traded honors for political contributions and endless questions about when Blair would step down overshadowed his last term in government, after winning the third term in May 2005.
Blair has stopped short of openly endorsing Brown, a stern Scot who has long coveted the top job, but said last week that Brown would make "a great prime minister."
"One of the things I very much hope will be part of the legacy of the government is the strongest economy in the Western world which he has been responsible for," Blair said.
Blair led Labour to two landslide election wins in 1997 and 2001, and a narrower but still comfortable victory in 2005.
The first term was marked by several significant initiatives: the Bank of England was given the freedom to set interest rates, Scotland and Wales were given regional governments, London gained an elected mayor and all but 92 hereditary members were ejected from the House of Lords.
In 1998, Blair and Irish Prime Minister Bertie Ahern led successful negotiations for a peace agreement in Northern Ireland, launching a process which reached its culmination earlier this week as former enemies from the Protestant and Catholic communities joined to form a new regional government.
The Iraq war severely dented Blair's popularity. Blair's close alliance with President Bush was unpopular at home, there were mass marches in Britain opposing the U.S.-led invasion before it began, and the government's claims that Saddam Hussein was building an arsenal of weapons of mass destruction proved false.
For more than a year, Labour has consistently trailed in opinion polls behind a Conservative Party revived by its new leader, David Cameron.
In local and regional elections earlier this month, Labour lost hundreds of seats in city and county councils, and was beaten into second place in the Scottish Parliament elections by the Scottish National Party, which advocates independence.
In recent months, Blair's thoughts have turned to the lessons of his decade in power.
"When I first started in politics, I wanted to please everyone," Blair said during a tour of the Middle East in December. "After a time I learned that you can't please everyone, and you learn that the best thing is to do what you think is right and everyone can make their judgment."
Blair is the first British prime minister since Harold Wilson in 1976 to leave at a time of his own choosing, rather than by losing an election or being forced out by the party.
Blair's leaving had little of the drama of downfall of Margaret Thatcher, who announced her resignation in 1990 just nine days after she was the target of a savage resignation speech by her former Cabinet colleague, Geoffrey Howe.
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