President Donald Trump’s personal assistant, John McEntee, was escorted out of the White House on Monday, two senior administration officials said. The cause of the firing was an unspecified security issue, said a third White House official with knowledge of the situation. White House press secretary Sarah Sanders declined to comment saying, “We don’t comment on personnel issues.” McEntee didn’t return a call seeking comment. McEntee was one of the longest-serving aides to Trump, dating back to the earliest days of the campaign...