Biden, allies pushed out Ukrainian prosecutor because he didn't pursue corruption cases

 https://www.usatoday.com/story/news/politics/2019/10/03/what-really-happened-when-biden-forced-out-ukraines-top-prosecutor/3785620002/

At the heart of Congress' probe into the president's actions is his claim that former Vice President and 2020 Democratic frontrunner Joe Biden strong-armed the Ukrainian government to fire its top prosecutor in order to thwart an investigation into a company tied to his son, Hunter Biden. 

It wasn't because Shokin was investigating a natural gas company tied to Biden's son; it was because Shokin wasn't pursuing corruption among the country's politicians, according to a Ukrainian official and four former American officials who specialized in Ukraine and Europe.

Shokin's inaction prompted international calls for his ouster and ultimately resulted in his removal by Ukraine's parliament.