investigation. so far former officer dean hasm. lester now to the impeachment inquiry in washington and testimony today from a key witness on the trump administration s dealings with ukraine. we get more from nbc s kristen welker. reporter: tonight, the president s former top russia advisor delivering critical testimony on capitol hill, a person familiar with the matter telling nbc news fiona hill planned to tell lawmakers that the president s outside lawyer rudy giuliani sidestepped official channels to run a shadow foreign policy in ukraine. giuliani denied that allegation to nbc news today. chairman of the house intelligence committee ada gdh appearance is also stoking fear among people close to the president thursd a source familiar with his sondland plans to c that when he told the top diplomat in ukraine there was no quid pro quo, he was relying solely on what president trump