America's Special Relationship Changes

U.S. President Barack Obama flew into London on Thursday evening for a three-day visit. His arrival comes shortly after the official start of campaigning for the June 23 Brexit referendum, in which the British public will decide whether to remain in the European Union. During his visit, Obama is expected to advocate a "remain" vote. And on Friday, he and the first lady will join Queen Elizabeth II for lunch in honor of her 90th birthday....