now where senate investigators have reached a deal with the president's son don junior to testify about the Russia investigation. Our chief congressional correspondent Mary Bruce has the latest. Don juniorbalked. Reporter: That forced the committee to issue a subpoena. But now this morning they have reached a deal. Donald Trump Jr. Is agreeing to come in and be interviewed behind closed doors sometime next month limited in its scope but this deal now ends what had become a pretty tense standoff here on the hill between the president's son and the republican-led committee that put a lot of Republicans in a really awkward position and now he is promising to pay back the loyal Republicans that stood by a source telling us trump Jr. Will return the favor come the 2020 campaign. Wonder what that means exactly. Meantime, on the house side, the house intelligence committee is now investigating trump lawyers for possible obstruction. Reporter: Yeah, George, this all stems from claims made by Michael Cohen. He told lawmakers that these lawyers close to the president had helped him to craft false testimony regarding that trump tower deal in Moscow. Now the committee wants to know if these lawyers helped to obstruct their investigation. They're demanding testimony and documents but these lawyers are making it clear they do not plant to comply, George. They are citing attorney/client privilege. The question is what other evidence the committee has. Okay, Mary Bruce, thanks very much.