NEW YORK — A man was killed in a raging apartment fire on Saturday in the New York City skyscraper named for President Donald Trump and where his business is based, officials said.Commissioner Daniel Nigro said a 50th-floor apartment at Trump Tower was "virtually entirely on fire" when firefighters arrived after 5:30 p.m."It was a very difficult fire, as you can imagine," Nigro said in a briefing outside the building in midtown Manhattan.