C-SPAN just played a clip of Slump yesterday doing a rally in Erie, PA. The clip was him talking about whether he should participate in the debate in August.
He basically argued... why would I get up there with a hostile network (Fox) and 12 hostile opponents at 0%?
Imagine thinking Fox is hostile to Trump. Or that the other GOP candidates save Chris Christie, are hostile to Trump. Maybe he thinks their testicular cupping used insufficient number of hands?