[Socon-Econ]

A “favor” would be something like: “Give to my campaign fund.” Or, “Hire my son.” Or, “Spy on young Biden for me.”

[MNJohnnie]

Or in this case. Investigate the reports of criminal wrong doing by the US Govt in the Ukraine as we are required to do by law.

Such as this open bragging of corruption by the former VP.

https://www.realclearpolitics.com/video/2019/09/27/flashback_2018_joe_biden_brags_at_cfr_meeting_about_withholding_aid_to_ukraine_to_force_firing_of_prosecutor.html