WASHINGTON — President Donald Trump on Monday denied he ever worked for Russia against U.S. interests, addressing an extraordinary question that has haunted his presidency and shows no sign of going away. Speaking from the South Lawn, Trump issued a flat denial: “I never worked for Russia.” He blasted former FBI and Justice Department officials and repeated his claim that the investigation into his ties to Moscow is a hoax. Trump raised eyebrows over the weekend when he didn’t directly answer the Russia question in an interview with Fox News host Jeanine Pirro, a personal friend. He was asked about a New York Times report that law enforcement officials began investigating, in 2017, whether Trump had been working on behalf of Russia against U.S.