Yes, actually. There are a few emails.
Emails Show Budget Office Working to Carry Out Ukraine Aid Freeze
https://www.nytimes.com/2020/01/22/us/politics/ukraine-aid.html
He exerted the will of our country at the direction of the official policy of the United States, European allies, and the International Monetary Fund, though. That it also benefited his son doesn't make it illegal.
Ya'll seemed VERY pumped about this before - shocking the lack of discourse now. Anyway, the Jack Burkman press conference is at noon. Hope Hedge live posts it here.