@health, you can read the articles written in plenty of major papers at the time (when the guy was fired) which consistently support that firing this prosecutor was a major goal of the US and other countries donating money to Ukraine. If you think Obama was not aware of what Biden was doing you are simply in denial.
This is such a non-issue that you bringing it up is simply a poor reflection of any ability by you to separate fact from conspiracy.
Trump, withheld money and wanted Ukraine to announce an investigation into Biden in order to hurt Biden’s election chances. That is corruption. Seems like Trump understood that Biden could beat him in an election. One thing Trump got right!