King Charles visits White House for state dinner, after rare address to Congress

What to know about King Charles' visit to D.C.King Charles III and Queen Camilla have arrived at the White House for a state dinner hosted by President Trump and first lady Melania Trump.Earlier Tuesday, the king addressed Congress, speaking about what he called the "truly unique" relationship between the U.K. and the U.S. and repeatedly stressing the importance of the alliance. He received a standing ovation when he said "executive power is subject to checks and balances."Charles' address to lawmakers is only