Denial seems to be your freind, same approach as Trump.
The evidence confirms Trump with held the aid to Ukraine illegally and only reason he did it was for his own political gain. There is no other explanation for it.
Then there is obstruction, that is completely self evident. He didn't even bother to use executive privilege, but we know why. To claim executive privilege he would have to explain why but that would be tricky.
As for Biden, the republicans could have allowed for more witnesses and evidence and called Biden to testify but they didn't.
Anyway as I said Biden is a separate issue, this impeachment trial is about if Trump abused his power and obstructed congress. Matters not if Biden is guilty of some thing, that can get investigated separately
