Yovanovitch was set to testify before Congress, despite President Donald Trump‘s position that his administration would not cooperate with the investigation. The president said earlier this week that he would block officials from testifying.
Yovanovitch, who was recalled from her post in May, remains on the State Department payroll as a fellow at Georgetown University.
She was recalled amid a push by Trump’s personal lawyer, Rudy Giuliani, to convince Ukrainian officials to investigate baseless corruption allegations against Joe Biden and his family.
A former diplomat, recalling a recent conversation with Yovanovitch, was removed after insisting that requests for investigations be relayed according to long-established protocol.
Gordon Sondland, the US ambassador to the European Union, is expected to testify next week before the House committees investigating Trump and Ukraine, Axios reported on Thursday, citing three congressional sources.
On Tuesday, the State Department banned Sondland, a major Trump political donor, from appearing at a closed-door meeting of the House panels investigating the president.
Trump on Thursday used a campaign rally to blast the impeachment inquiry against him as a “brazen attempt” by Democrats to overthrow him, promising the move would backfire.
Trump Impeachment Inquiry: Ex-Ukraine ambassador testifies Trump pressured State Department to oust her.