house democrats say they want to hear from some of these next three people. t.ulrich brechbuhl. he is a deputy and is listed by the whistle-blower of being on the call. kurt volker, he resigned as special representative to the ukraine in the wake of the whistle-blower complaint. volker helped connect giuliani with officials. next is gordon sondland. according to the complaint, he went with volker to give y ukrainians advice. he allegedly worked to contain the damage to u.s. national security allegedly created by ru rudy giuliani. not mentioned in the complaint is mick mulvaney.