Oops! Adam Schiff's star witness may have lied under oath — not a good look for public testimony slated next week in the "impeachment inquiry." Last night, Tucker Carlson revealed that his show had received exclusive access to an email from the personal account of former ambassador to Ukraine Marie Yovanovitch that contradicts testimony she offered under oath. The fired former ambassador who disagrees with Trump administration policy is a key witness for Adam Schiff's impeachment efforts. The segment is embedded below [update: Fox News appears to have blocked the video for more than one second] and was explained online by Greg Re of Fox News:

Former U.S. Ambassador to Ukraine Marie Yovanovitch, a key witness in House Democrats' impeachment inquiry, communicated via her personal email account with a Democratic congressional staffer concerning a "quite delicate" and "time-sensitive" matter — just two days after the whistleblower complaint that kickstarted the inquiry was filed, and a month before the complaint became public, emails obtained Thursday by Fox News showed.

The emails appear to contradict Yovanovitch's deposition on Capitol Hill last month, in which she told U.S. Rep. Lee Zeldin, R-N.Y., about an email she received Aug. 14 from the staffer, Laura Carey — but indicated under oath that she never responded to it.

The communication came "from the Foreign Affairs Committee," and "they wanted me to come in and talk about, I guess, the circumstances of my departure," Yovanovitch testified, describing Carey's initial email. "I alerted the State Department, because I'm still an employee, and so, matters are generally handled through the State Department."

Yovanovitch continued: "So, she emailed me. I alerted the State Department and, you know, asked them to handle the correspondence. And, she emailed me again and said, you know, 'Who should I be in touch with?'"

Fox News is told it is a breach of normal procedure for congressional staff to reach out to a current State Department employee at their personal email address for official business.

Asked directly whether she responded to Carey's overtures, Yovanovitch testified only that someone in the "Legislative Affairs Office" at the State Department had responded to Carey, to the best of her knowledge.

Yovanovitch did not indicate that she had responded to Carey's first email in any way, and testified explicitly that she did not reply to Carey's follow-up email concerning whom she should contact at the State Department.

However, emails obtained by Fox News' "Tucker Carlson Tonight" showed that in fact, Yovanovitch had responded to Carey's initial Aug. 14 email, writing that she "would love to reconnect and look forward to chatting with you."