MSNBC’s Joe Scarborough urged president Joe Biden to take on Donald Trump directly over his son’s felony conviction on firearms charges. The president and his Republican challenger are scheduled to face off June 27 in a debate, and the “Morning Joe” host encouraged Biden not to back down if Trump attacked his son Hunter Biden’s conviction for lying about his drug use on a federal background check form and possessing a gun while addicted to, or using, illegal drugs. “If I’m Joe Biden and I’m on the debate stage with Donald Trump and he starts talking about Hunter Biden as some sort of retort ag…