If you are paying attention to the impeachment hearings, what Joe Biden did is what was being investigated by the Trump administration. The Democrats are saying Trump made a “quid pro quo” to announce an investigation into this. There is no evidence of any such deal that an investigation was done in exchange for aid, although the Ukraine president Zelensky did mention the Bidens.
As I’m sure you are assuming its true, the question would be whether there is warrant for such an investigation, which it is very plain that it is.
You have a compliant news media saying, at every turn, that it is a ‘conspiracy theory’ and has been ‘debunked.’ Which, of course, there is very visible and plain evidence for, and has never been looked into.