Watch live: Ambassador Sondland testifies in public impeachment hearing

U.S. Ambassador to the European Union Gordon Sondland is scheduled to testify Wednesday morning in a highly anticipated appearance before the House Intelligence Committee as part of the impeachment inquiry into President Trump's dealings with Ukraine. 

Sondland originally testified behind closed doors that he did not know precisely why U.S. military aid to Ukraine was held up and said that, in a September phone call, Trump denied using nearly $400 million in U.S. military aid as leverage to get Kyiv to open two politically motivated investigations. 

But the Trump donor and political appointee revised his testimony earlier this month to say that he "presumed" that the delayed military aid was conditioned upon Ukrainian President Volodymyr Zelensky announcing investigations into 2016 election interference and Burisma Holdings, a Ukrainian energy company that employed the son of former Vice President Joe Biden, who is running for president.

The hearing is scheduled to begin at 9 a.m.

Watch the live video above.