Biden is 13th and final US president to meet Queen Elizabeth

FILE - The June 10, 1984 file photo shows Queen Elizabeth II, second left, standing with, West German Chancellor Helmut Kohl, left, U.S. President Ronald Reagan, second right, and Britain's Prime Minister Margaret Thatcher at London's Buckingham Palace, prior to a dinner for summit leaders. (AP Photo, File)

Biden is 13th and final US president to meet Queen Elizabeth