As Trump was rising in the polls in 2016 ,the emperors' White House invited Ukraine’s top prosecutors to Washington to discuss" fighting corruption in the country."
The meeting turned out to be more of a pretext for them to pressure Ukraine’s prosecutors to drop an investigation into the Burisma Holdings gas company that employed Hunter Biden and to look for new evidence in a case against Trump campaign chairman Paul Manafort that the FBI had dropped in 2014 .Two top Ukrainian officials , including member of Parliament Serhiy Leshchenko ,released evidence to the American media, smearing Manafort. The release of the evidence forced Manafort to step down as Trump’s top campaign adviser. A Ukrainian court concluded that the release of the evidence amounted to an unlawful intervention in the U.S. election by the government of Ukraine . This happened the same time that Biden was threatening withholding $1 billion in crucial US aide if Ukraine's President Poroshenko did not drop the investigation of Burisima ;and demanded that the prosecutor be fired .