Former President Donald Trump might have to be removed from the courtroom in Manhattan if he exhibits his typical behavior — and former federal prosecutor Joyce Vance has some thoughts on how that might work. This comes after Judge Juan Merchan gave Trump a standard defendant warning that outbursts at trial might lead to his detention — and after his own attorneys pleading with him to stay calm and not blow up. “Judge Merchan tells Trump that if he disrupts the trial they will proceed without him & if he doesn’t show up ‘there will be an arrest,'” Vance said in a post on X. “I recall a trial h…