2 Articles of Impeachments have been filed against President Donald Trump... One is an abuse of power and the other is the Obstruction of justice.
So pretty much quid pro quo isn't being pushed as a reason to impeach trump and neither was Russia gate... In essence, Democrats are saying "Trump abused his power to pursue a corruption investigation into Joe Biden and obstructing our sham investigations against him since we have nothing on him in regards to our other serious claims".