robert mueller. meanwhile, chris koons of delaware, and jackie spears, a democrat from california, and ken delaney, it to start with ken here, our guy here, the subject of the investigation, the michael flynn, the younger now involved in what. why is he joining this mess? >> well, chris, the subject of the investigation means that the prosecutors in the grand jury suspect you may have committed a crime but they need more information to find out. so it's more serious as being a witness, but not as serious as being a target which means you're about to be indicted. michael flynn, the father, appears to be facing jeopardy regarding his involvements in turkey and the failure to disclose items on his security clearance application. and mike flynn, his son, was his right-hand man, the chief of staff, executive assistant, involved in filling out forms so that makes flynn's, the special counsel's interest in him, important. if flynn wants to look at the involvement in collusion, investigating his son is another way to put pressure on mike flynn, the former national security adviser. >> tell me how a criminal