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>> reporter: mueller coming before congress is, obviously, the next first step. this is why washington has been in a holding pattern. nadler saying he wants to do it in a private setting is a game for changer. for democrats this is all about getting the information before the american people. they already know that they think what they have in this report is tantamount to impeachable offenses. they need to bring the public a that's that's a tension because now it looks like this will all take place behind closed doors. >> the question is how far will bob mueller actually go in his i testimony?...

Blower christopher wylie is testifying before lawmakers in the you can this morning. his testimony comes after reports of cam cambridge analytica misused facebook profilers of 50 million people for political began. >> the 50 million number is what is -- is what the media has felt safest to report. but my recollection, because of the documentation they can rely on -- my recommendation is that it's higher than that. so, i -- my on views it was much more than 50 million. >> nbc's kelly joining me from london. what else has come out of hi testimony so far? >> chris, quite a wide range of topics co...