During President Trump's impeachment, former U.S. Ambassador Marie Yovanovitch testified before Congress [under oath] that she knew little beyond an initial briefing and "press reports" about Burisma Holdings, the Ukrainian natural gas firm that had hired Vice President Joe Biden's son Hunter and was dogged by a corruption investigation. "It just wasn't a big deal," she testified under oath on October 11, 2019. But newly unearthed State Department memos obtained under the Freedom of Information Act [show otherwise].