WASHINGTON (CNN) -- In his final weeks as prime minister of Britain and at what is likely to be his final news conference in the White House Rose Garden, Tony Blair expressed no regrets Thursday for the steadfast support of President Bush's policy on Iraq that has cost him dearly at home.

"I have taken the view that Britain should stand shoulder to shoulder with America," Blair said. "After September 11th, I have never deviated from that view. I have never regretted that view."

Blair said battles over values are not won "by being a fair-weather friend to your ally or withdrawing support for each other when the going gets tough. You don't win those battles by losing the will to fight if your enemy's will to fight is very strong or very powerful."

But Blair allowed that "history will judge" whether his support of the U.S.-led attack on Iraq and subsequent occupation was the right move.

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