going after ybarra. i want to suggest that these could be challenged. if one of these potential defendants, like say donald trump jr. or manafort or michael cohen goes into court and says i have a pardon. i think there is standing for a prosecutor to say, these pardons are not valid. to make this constitutional argument to a judge and for a judge to agree the pardons are not valid. there is a potential step by step constitutional argument to watch for, if trump is playing this out to use these pardons unfaithfully. >> they could wind up before the u.s. supreme court as we know. shau thank you for joining us. susan, you will be back. thank you to you. north korea's former spy chief, right hand man to kim jong-un will deliver a letter from the dictator to president trump.