Oh, spoiler alert - Everybody in the world knew and knows Ukraine has a big problem with corruption - news flash, that's why Biden and Obama didn't want to give Ukraine any aid until they fired a very
corrupt prosecutor who wasn't doing his job.
Also a news flash - Trump had no idea what was going on in Ukraine moreover, he didn't care until that is, until he found out Biden's son was working for Burisma via Giuliani.