acting attorney general informed the white house counsel that they wanted to give "a heads-up" to us on comments that may have seemed in conflict with what he had sent the president out in particular. >> reporter: we're hearing that gat yates is prepared to testify this was a forceful warning. this will be the first time that the acting attorney general will speak about the white house meeting and a source fam with the situation says she will be limited on what she can tell the committee because many of the details involving flynn are, of course, classified but she can give more color about that conversation. her previously scheduled appearance was canceled by chairman devin nunez. the move sparked outcry tofrom democrats who thought he was trying to shield the white house