ukraine president quote contacted me and was very concerned asking about the withheld security assistance. so ukraine did know. but what do you say to that republican defense now? >> well, first off, i think we have to make something very clear. there doesn't have to be a philadelphia wrote quo. if the president asks a foreign government to interfere with a u.s. election that's the is unlawful and us precedented. >> that alone is a major problem and major national security threat. in addition to that we have allegations of a quid pro quo that are being corroborated by multiple sources of information which makes it even worse, so let's really zoom back out and remember what this is all about. you have the sitting president of the occupation asking a foreign government leader, the president of ukraine to participate actually initiate an investigation against a political opponent for his personal political gain. and in doing so, withhold $400