and the ukraine. >> reporter: biden campaign released a statement saying on joe biden's watch the u.s. made a eradicating corruption a centerpiece of our policy toward ukraine including achieving the removal of an inept prosecutor who shielded wrongdoers from accountability. in response to fighting in syria that appeared to signal turkey's violation of a day-old cease-fire, the president insisted he was on top of the situation. mr. trump then made the bizarre claim that the u.s. is somehow in control of oil assets in the region. something that is just not true. >> we have isis under control. we've taken control of the oil in the middle east. the oil that we're talking about. the oil that everybody was worried about. we have -- the u.s. has control of that. and there are no shots being fired. and a lot of people are doing a lot of things. >> reporter: at his rally in dallas, he minimized the conflict between turkey and kurds allies as a schoolyard fight. >> sometimes you have to let them fight. like two kids in a lot, you got to let them fight and then pull