Prince Charles and Duchess of Cornwall visit U.S. (9 images)

His Royal Highness Prince Charles (L) chats with a group in period costume at America's first President, George Washington's estate, March 18, 2015, at Mount Vernon, Virginia. The Prince of Wales and his wife Camilla Parker-Bowles are on a three-day visit to the Washington area with social, cultural and bilateral stops, promoting ties between the United Kingdom and the United States. Photo by Mike Theiler/UPI

His Royal Highness Prince Charles (R) and his wife the Duchess of Cornwall Camilla Parker-Bowles (2nd,L), arrive for a tour of America's first President, George Washington's estate, escorted by Regent Barbara Lucas (L) and Virginia Gov. Terry McAuliffe, March 18, 2015, at Mount Vernon, Virginia. The Royals are on a three-day visit to the Washington area with social, cultural and bilateral stops, promoting ties between the United Kingdom and the United States. Photo by Mike Theiler/UPI

His Royal Highness Prince Charles (R) is escorted by Steve Bashore in period costume as they tour America's first President, George Washington's estate, March 18, 2015, at Mount Vernon, Virginia. The Prince of Wales and his wife Camilla Parker-Bowles are on a three-day visit to the Washington area with social, cultural and bilateral stops, promoting ties between the United Kingdom and the United States. Photo by Mike Theiler/UPR

Britain's Prince Charles chats with civil rights leader Jesse Jackson during a visit to the Martin Luther King Memorial Jr. Memorial on March 18, 2015 in Washington, DC. Prince Charles (C) and his wife Camilla, Duchess of Cornwall, are on a four-day trip to the United States. Pool Photo by Mandel Ngan/UPI