such concern about this? >> reporter: well, we have known about this meeting for a very long time, but what is only recently come to light is the fact that trump may have had advanced knowledge of this meeting or, very at the least, may have been told about it shortly after the fact. michael cohen is preferred to testify to special counselor robert mueller that trump had a heads-up about that meeting and contradict what donald trump jr. has already told congressional investigators. rudy giuliani, trump's personal attorney, is denying that trump jr. is in legal jeopardy telling cnn n a statement, it is not so. after over a year or more of investigating there is no wrongdoing on his part for that matter the president. nothing has changed. we are not worried about michael cohen he has no knowledge of wrongdoing and recorded it in one version or another so often that he can't be believed or relied on. sources tell telling cnn that