whistle-blower complaint upon relying on hearsay. david and christine? >> okay, jim acosta, thank you. the president also saying yesterday he had not spoken with chinese president xi jinping about investigating unproven claims about the bidens. that, however, is not true. cnn has learned exclusively mr. trump did raise joe biden with president xi in a june phone call. the president's suggestion that the chinese investigate the bidens thrust his political grudge into the world's most complicated and consequential relationship. kylie atwood has more. >> reporter: christine and dave, during a phone call between president trump and president xi in june, we are learning that trump did mention joe biden, the former vice president, now his most formidable democratic opponent leading up to 2020.