buying into these notions. >> okay, i've noticed. by the way, the people that believe in a conspiracy theory, they believe in all of them. >> that's probably true. >> at the outset the drive to advance -- and trump is one of them. anyway, trump's political agenda in ukraine was described as a separate irregular channel of foreign diplomacy. here's ambassador taylor. >> there appeared to be two channels of u.s. policymaking and implementation, one regular and one highly irregular. the official policy of the united states was undercut by the irregular efforts led by mr. giuliani. >> as we learned now the irregular channel pushed out ambassador yovanovitch who stood in his way. >> sullivan told me there had been a concerted campaign against me. that the president no longer wished me to serve as ambassador to ukraine. i still find it difficult to comprehend that foreign and