His speech in Congress was just right yet contained numerous subtleties such as the executive checks and balances reference which surely cannot have been lost on Trump. The King delivered the very gracefully with some humorous moments and captured the attention of all who were present
He then gave a speech at the state dinner in the White House which was just as good. I have no idea of the King's opinion of Trump, but it's clear that the British government's position is diplomacy first. I can also imagine that the King had somewhat more input into these speeches than perhaps his mother ever did.