john sail was on back in may. >> up until october 20, 1973, there was no serious talk about impeachment. but the saturday night massacre. i was fired. along with my bosses. that's what changed public opinion and that's what's it's all about. if the trump white house continues to maintain public opinion on this, no matter how they do it. there will be no threat to the president. >> public opinion appears to be changing. let's put this up. cnn poll yesterday showing support for impeachment at 47%. up significantly from the past few months. do you think there's a threat to the white house now? more real to them than ever? >> it must. if the president would come out of denial it would be now. he's very attune to public