Former President Donald Trump has a particular threatening comment that he always falls back on when he senses he’s no longer able to game the system, biographer Tim O’Brien told MSNBC’s Joy Reid on Wednesday evening. This comes as the former president faces a mounting pile of legal cases, both civil and criminal, few of which appear to be going his way. “Trump was supposed to testify in his other case he’s freaking out about, the money case in … New York,” said Reid. “He’s not going to testify anymore because the rules said he couldn’t go and do a political speech and he couldn’t yell at th…