Washington — It's not a palace, but next month the White House is set to be overrun by royals. In separate visits, President Trump is planning to host monarchs from the United Kingdom and the Netherlands next month. King Charles III is set to visit sometime in April, a source told CBS News, but there were no further details about the visit. Mr. Trump visited London last September for a state visit, and attended a lavish state dinner hosted by Charles and Queen Camilla at Windsor Castle outside