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called? why did this interaction raise concern? >> well don witness tampering is serious. it's a crime, as miss cheney stated during the hearing we pass along this information to the doj to look into it further. we take very seriously the safety of any witnesses anyone who comes forward to the committee. likewise, their privacy in this case. any speculation about who this person might have been and a lot of people trying to tie it together. the committee will just say. we want to protect this witness. we also want to hold people accountable who have potentially broken a law. >> chair...

And political commentator -- senior staff editor at the new york times opinion. good to see you both. david, there's a lot of trolling in politics. but why do you think obama felt the need to respond? >> i think he was trying to do the right thing. but i think, don, in this case, president obama miscalculated for two reasons. one reason is that, no matter his intentions, it comes across as a sane, please don't pick on my friend. president biden, then vice president biden, can defend himself. he defended himself by winning that election. now this letter is out it kind of makes him look a little...