What exactly is Trump's "surprise card"? Is it a bluff, or a killer move?

Video: What exactly is Trump's "surprise card"? Is it a bluff, or a killer move? Let's see what else he has up his sleeve. 川普的「驚人牌」究竟是啥？虛張聲勢，還是終極殺招？來看看他還有什麼牌!