he was involved in all of president trump's suspicious activities and decisions, including the president's firing of national security adviser michael flynn for lying to the fbi, james comey after the president asked james comey to back off the investigation of michael flynn. the president's attempted firing of jeff session and the president's attempted firing of special prosecutor robert mueller. the attempted firings were both strongly opposed by don mcgahn, according to multiple reports. for each of those incidents mcgahn is an important witness in robert mueller's investigation of obstruction of justice. 11 days ago mr. mcgahn gave to mr. mueller's investigators, people said, a sense of the president's mindset. joining us now jill wine-banks, former assistant watergate special prosecutors, ron klane