Check out in this video, start at 1:29, go frame by frame if you want (use that pause button), he places his hand on her arm, initiating contact, and pushes her away from him while pulling back the White House mic as he tries to hijack a presser for his own use. He then says, "Pardon me, ma'am".. Watch her reaction as she turns to the President in shock... then kneels down and clearly is working through what just happened and what to do about it.
The White House is absolutely in the right on this one, until he apologizes to her and the WH, and his boss explains how they will make sure that their reporters understand that putting their hands on White House staffers in the Press room is not okay, they should revoke access to CNN, IMHO. It isn't okay to push around women just because you think this is a one on one session at CNN rather than a WH press briefing with the President.