U.S. President Barack Obama is in Europe for what could be his last trip to the region before his presidency ends in November following an U.S. election.
Obama landed in London on Thursday evening and will use his visit to highlight the "special relationship" between the U.K. and U.S. and to make a call for the U.K. to remain in the European Union, ahead of a closely-fought referendum on the subject due to be held on June 23.
"The European Union doesn't moderate British influence - it magnifies it," he wrote in the Daily Telegraph newspaper. "The United States sees how your powerful voice in Europe ensures that Europe takes a strong stance in the world, and keeps the EU open, outward looking, and closely linked to its allies on the other side of the Atlantic…Now is a time for friends and allies to stick together," he said.
The president is due to have lunch at Windsor Castle with Queen Elizabeth, who celebrated her 90th birthday on Thursday, and her husband Prince Philip and will then travel to meet Prime Minister David Cameron before a press briefing at 1730p.m. London time.