Read it for yourself, this is what the President said about Biden to the Ukraine president. This led to today's impeachment vote.
CHOOSE GREATNESS
The President: (top of page 4)
...The other thing, (sic) There's a lot of talk about Biden's son, that Biden stopped the prosecution and a lot of people want to find out about that so whatever you can do with the attorney General would be great. Biden went around bragging that he stopped the prosecutions if you can look into it... It sounds horrible to me...
Source: scribd.com/document/427409665/Ukraine-Call-Transcript#fullscreen&from_embed
We all know this. It's the "obstruction of congress" count that gets me. Did he obstruct them from voting on USMCA? Is that what they're really pissed about?