Further reporting suggests why: The complaint appears to include an allegation Trump himself, in communications with newly elected Ukrainian President Volodymyr Zelensky, repeatedly pushed for the opening of an investigation into a company linked to Hunter Biden, younger son of Democratic presidential frontrunner Joe Biden. In 2016, then-Vice President Biden successfully pressed for the dismissal of a corrupt Ukraine prosecutor looking at a case against a company on whose board the younger Biden sat. Some $250 million in approved military aid may have been contingent on Zelensky’s cooperation.