>> manu, thank you very much. let's bring in our panel. we have political analyst abby phillip and david gregory and david sanger. david gregory, what are the potential impact of the testimony from yates and clapper today? >> i think they will both be limited in what they can say. from yates, she will contradict from white house officials about the warning they gave about general flynn. i think the white house will make it clear they acted swiftly once they knew he was not truthful. the remaining questions are what extent did he advise the president. to candidate trump, the views he shaped of russia at the time. to say nothing of contacts that were not appropriate. i feel we're on the margins here even with clapper and what he can say in open session. what we know is what we have