

President Barack Obama and British Prime Minister David Cameron participate in a joint news conference at Lancaster House in London on May 25. Charles Dharapak/AP
Prime Minister David Cameron and President Obama serve food alongside Samantha Cameron and first lady Michelle Obama during a barbecue in the garden of 10 Downing Street in London on May 25. Matt Dunham/Reuters
Members of the British and US armed forces arrive for a barbecue in the gardens of 10 Downing Street in central London on May 25. Alastair Grant/AP
Men protest outside the Houses of Parliament before a visit from President Obama in London on May 25. Darren Staples/Reuters
The armored limousine carrying President Obama leaves Downing Street in London on May 25. There will be no 'let-up' in pressure on the government of Libyan leader Muammar Qaddafi, President Obama said, adding he believed that ultimately Qaddafi would step down. Darren Staples/Reuters
Britain's Queen Elizabeth II, President Obama, first lady Michelle Obama, and Prince Philip stand in Buckingham Palace, London, ahead of a state banquet on May 24. Chris Jackson/AP
Queen Elizabeth II and President Obama enjoy a state banquet in Buckingham Palace in London on May 24. President Barack Obama immersed himself in the grandeur of Britain's royal family, as Queen Elizabeth II welcomed him to Buckingham Palace for the first day of a state visit. Lewis Whyld/AP
President Barack Obama, first lady Michelle Obama and the Dean of Westminster, Rev. John Hall take part in a wreath laying ceremony at Westminster Abbey in London, on May 24. Carolyn Kaster/AP
Britain's Prime Minister David Cameron (l.) and US President Barack Obama walk into 10 Downing Street in London on May 24. Obama and Cameron are to announce the formation of a US-British national security council to work together on international challenges and share intelligence, an Obama administration official said. Luke MacGregor/Reuters
A demonstrator holds a banner in Whitehall before a visit by US President Barack Obama to Britain's Prime Minister David Cameron, in central London on May 24. Darren Staples/Reuters
A police officer searches a man after clashes between the English Defence League and Muslim groups, in London on May 24. Darren Staples/Reuters
Britain's Prime Minister David Cameron (l.) and his wife Samantha (2nd l.) meet with President Barack Obama and first lady Michelle Obama at 10 Downing Street, Cameron's official residence, in London, on May 24. Akira Suemori/AP
President Barack Obama and first lady Michelle Obama pose for photographs with Britain's Queen Elizabeth II and Prince Philip at Buckingham Palace in London on May 24. President Obama is on a four-nation European visit to Ireland, England, France, and Poland. Toby Melville/AP
An honor guard passes Queen Elizabeth II, President Obama, Prince Charles, first lady Michelle Obama, and Prince Philip, Duke of Edinburgh, at Buckingham Palace in London on May 24. Kevin Lamarque/Reuters
President Obama inspects the 1st battalion Scots Guards with Britain's Prince Philip at Buckingham Palace in London on May 24. The Obamas traded in Irish charm for the pomp and pageantry of England as they began a two-day state visit at the invitation of Queen Elizabeth II. Adrian Dennis/AP
President Obama and first lady Michelle Obama talk to Britain's Prince William and Catherine, Duchess of Cambridge, at Buckingham Palace in London on May 24. Toby Melville/Reuters
An armed police officer keeps guard as the convoy carrying President Obama drives into Buckingham Palace in London on May 24. Kirsty Wigglesworth/AP
The convoy carrying President Obama drives into Buckingham Palace in London on May 24. Kirsty Wigglesworth/AP
President Obama and his wife Michelle step down from Air Force One after arriving at Stansted Airport near London on May 23. Obama is in London well ahead of schedule after concerns over an ash cloud spreading from a volcano in Iceland sped up his travel plans. Chris Radburn/AP
President Obama walks away after making a statement about the storms in Missouri and Minnesota at the Winfield House during a state visit to London on May 24. President Obama said he will visit a section of Missouri on May 29 where 116 people were killed by a massive tornado. Larry Downing/Reuters