If not for a whistleblower, who Trump has threatened and tried to discredit, we would not know what he was doing to get Ukraine to cook up an investigation into the Bidens. Ukraine would have made the announcement of the investigation (written by Giuliani himself) and the US media would be all over the controversy, with no idea that it was manufactured by Trump and his "personal lawyer", and bought with aid money from the US taxpayer.
...and subsequently Trump was all for releasing the tapes....