Joe Biden slams rival Donald Trump as a “sick f**k” to his close friends and aides when in private, sources have told US media. Three people have heard the President use the insult to describe Trump when Biden is behind closed doors, Politico reported. One claimed that Biden also recently said: “What a f***ing a****** the guy is.” The White House has declined to comment. Last month, during his Valley Forge speech commemorating the January 6, Biden almost swore on stage whilst describing Trump. He said: “At his rally, he jokes about an intruder, whipped up by the Big Trump Lie, taking a hammer …