The White House has been forced to publicly address Donald Trump’s relationship with his most loyal aide, Natalie Harp. Democrats have raised questions about Harp’s influence within the administration, and speculation has also arisen about a possible romantic relationship between the president and his much younger aide. But the opposition’s concerns center less on Trump’s private life than on Harp’s extraordinary access to the president and the role she plays in matters of both domestic and, at times, foreign policy.