Former President Donald Trump ramped up his threats to prosecute President Joe Biden if he wins another term in the White House. An appeals court rejected Trump’s claims of immunity in the federal election subversion case in the District of Columbia, although he intends to press the same argument in Florida, where he also faces federal charges for mishandling classified documents, and the ex-president issued what appeared to be a “blackmail” threat against his Democratic rival. “If a President does not have Immunity, the Opposing Party, during his/her term in Office, can extort and blackmail t…