Republican presidential candidate Donald Trump is threatening to skip CNN's town hall interview Tuesday night over the network's treatment of him. "Wow, @CNN has nothing but my opponents on their shows," he wrote on Twitter. "Really one-sided and unfair reporting. Maybe I shouldn't do their town-hall tonight!"Trump and rivals Ted Cruz and John Kasich are scheduled to be interviewed by the network in Wisconsin, one week before the state's primary.Trump has repeatedly threatened during his campaign to skip big events — and he's followed through at time.