If Trump gets impeached, Trump’s lawyers can subpoena people Joe Biden would like not to talk.
Exactly, which is why they will saber rattle the impeachment process through the election year. They don't want to give the President the process of discovery and have the witnesses fail to turn over requested evidence. That would be a nightmare for the dems.
I will go out on a limb and say no impeachment vote until they see the make up of the 2021 Senate. Then if they have a chance in the Senate and President Trump is reelected they will vote for impeachment.
In the meantime they will claim they have the goods on the President. They will claim he would be convicted in the Senate but they need to make sure all their Ducks are in a row so he can't slip out of the charges. CNN and MSNBC will sound the same chorus.