with then-president trump. so, i think this is critical. these are four critical people that the committee wants to say we're going after you whether or not you comply. >> jamie gangel, appreciate it. let's drill down more on this, we are joined by cnn chief legal analyst, jeffrey toobin. former fbi deputy director, andrew mccabe. also, senior political correspondent, abby phillip, host of inside politics sunday. so, andrew, how significant could these call logs or -- or phone records be to the investigation? >> so, anderson, the records are exactly as jamie described them. they give you the incoming and outgoing numbers that were called from that person's account and the time of -- the time the calls went through and their duration. they are crucial in setting up a timeline of that person's contacts and communications. they don't tell you what they said but they tell you exactly when they talked to specific other people.