Prince Charles’s office says he will travel to the U.S. in May for a brief visit that will include a trip to the White House. Charles, the heir to Britain’s throne, will meet with President Obama and give a keynote speech at a conference on sustainable agriculture at Georgetown University.The Prince of Wales last visited the U.S. in 2007 with his wife, the duchess of Cornwall.The office said Thursday the visit will take place May 3-5.