He told President Zelensky:

I heard you had a prosecutor who was very good and he was shut down and that's really unfair. A lot of people are talking about that, the way they shut your very good prosecutor down and you had some very bad people involved.

Think about this contrast. The President bashed a career American diplomat [YOVANOVITCH] and an anti-corruption champion whom he unceremoniously removed because she was viewed as an obstacle to his efforts to solicit foreign interference in the 2020 election and then at the same time praised someone who he thought could be an asset--a former Ukrainian prosecutor whom the free world views as an obstacle to the rule of law. The idea that President Trump cares about corruption is laughable. It is laughable.

The State Department called Lutsenko's claim of receiving a do not prosecute list, "an outright fabrication."
[...]
Lutsenko also said that he has not received funds amounting to nearly $4 million that the U.S. Embassy in Ukraine was supposed to allocate to his office, saying that "the situation was actually rather strange" and pointing to the fact that the funds were designated, but "never received."