>> but what this call indicates as other testimony has indicated is that the instructions are coming from the president on down. >> reporter: taylor and deputy assistant secretary of state george kent describing what they encountered as using military aid and a meeting at the white house as leverage for ukraine to begin investigations for the president's political gain. >> to withhold that assistance for no good reason other than help with a political campaign made no sense. it could not be explained. it was crazy. >> reporter: concerns about rudy giuliani's involvement in u.s. relations with ukraine. including helping lead a smear campaign against then-u.s. ambassador to ukraine marie yovanovitch. >> i became alarmed as those efforts bore fruit. they led to the ouster of yovanovitch and hampered efforts in ukraine. >> reporter: house democrats asking about giuliani's intent.