At same time Trump has been saying his efforts on Ukraine were to combat corruption...
The plot to oust US Ambassador Yovanovitch was led by the highly corrupt prosecutor Lutsenko—because she was stymying his corruption. And the President of the United States obliged him.
"There was this personal payback dimension."
“In his July call with Ukrainian President Zelenskiy, Trump praised Lutsenko and lamented that he was on his way out.”
Call transcript is ambiguous as to whether Trump is talking about Shokin/Lutsenko.
cc: @annaschecter @Tom_Winter @dandeluce