U.S. PRESIDENT BUSH WALKS THROUGH QUEEN'S GALLERY WITH BRITAIN'S QUEEN ELIZABETH AT BUCKINGHAM PALACE, 2003-11-19 (photo)

U.S. President George W. Bush (L) walks through the Queen's Gallery at London's Buckingham Palace with Britain's Queen Elizabeth (R) on the first day of the president's state visit to the UK, November 19, 2003. President Bush said on Wednesday that war was a justifiable tool to ward off aggression and that the United Nations must be willing to enforce its demands to remain relevant. He said he believed in international institutions such as the United Nations, which he bypassed to launch war on Iraq, but that the United Nations' credibility - and viability - depended on a willingness to keep its word and to act when necessary. REUTERS/POOL/Jim Watson ASA/JDP