I've read that in the Zelensky-Trump phone call:
Zelensky said he agreed with Trump "100 per cent" that the former US ambassador to Ukraine, Marie Yovanovitch, was "a bad ambassador."
And as context:
Yovanovitch was abruptly recalled by the Trump administration in May. Though she was widely respected in the national security community for her efforts to prod Ukraine to tackle corruption, she became the target of political attacks by conservative media outlets and Rudy Giuliani, Trump's personal laywer.
This comes pretty close to the fund freeze that Trump imposed on Ukraine, if I got that right.
But has Yovanovitch's recall been tied more directly to the efforts to have the Bidens investigated? E.g. was she asked to pressure Ukraine too [to investigate the Bidens], but she refused?
CNN summarizes some rather vague claims of this sort:
Giuliani has claimed without evidence on numerous occasions that Yovanovitch had impeded his investigation in Ukraine and has tied this baseless claim to a conspiracy theory involving funding from the billionaire George Soros.
But it's unclear from that what Giuliani's investigation into Ukraine was about, investigation that Yovanovitch supposedly obstructed somehow.
If nothing more clear transpired publically in that regard insofar, has the impeachment inquiry interviewed Yovanovitch already or announced they might be trying/planning to interview her?