UK royals host U.S. President Barack Obama and First Lady Michelle Obama for lunch at Windsor castle. CNN's Max Foster reports.
Ahead of scheduled talks with the U.K. prime minister on what he sees as a defining moment in the U.K.'s history, President Barack Obama arrived for lunch with .
Follow more action on Twitter @arbolioto One of the tricks of monarchic protocol is to make it obscure enough to catch guests and make them feel lesser beings.
US first couple will also dine with the Duke and Duchess of Cambridge and Prince Harry during their visit to UK this week The US president and first lady are to .
