tonight to the white house for ukraine documents and, separately, a letter seeking documents from the vice president. also today, reaction from joe biden. >> all this talk of the president about corruption comes from the most corrupt president we've had in modern history. he's the definition of corruption. he's indicted himself by his own statements. this is not about me. it's not about my son. he talks about how we should handle whistle-blowers. he talks about there will be a civil war. this is ta guy that's unhinged. he is unhinged. this guy like all bullies is a coward. he does not want to run against me. >> back now with our team of experts. van, you saw the former vice president fighting back there. how do you assess how he is handling this as of tonight? >> look, i mean he's actually making the most important point. what is all this about? why do we have all this shenanigans, all this nonsense?