Royal biographer Robert Hardman was granted a special audience with Donald Trump during this week’s U.K. state visit to the White House, and during his private meeting with the president, the author gained insight on the success of The King and Queen's trip . Hardman previously met President Trump at Mar-a-Lago while he was researching his new book Elizabeth II: In Private. In Public. Her Story , and was invited to present the president with a finished copy. Writing for the Daily Mail , the royal author said that he met with Trump the evening before The King and Queen departed, and the president had nothing but positive things to say about Their Majesties. “We've done a good job with the King, right?” President Trump told Hardman, who replied “that the British team seem overjoyed by the success of this trip.” Article continues below The King and Queen are pictured with Donald and Melania Trump at a White House state banquet on April 28.…