Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. US Ambassador to EU Set to Testify in Impeachment Inquiry Ken Bredemeier WASHINGTON - After the State Department blocked him from appearing last week, U.S. Ambassador to the European Union Gordon Sondland is scheduled to appear Thursday before House lawmakers conducting an impeachment inquiry into President Donald Trump's relations with Ukraine. The House Intelligence, Foreign Affairs and Oversight committees are holding the closed-door deposition where Sondland is expected to say Trump would only offer a White House visit to Ukrainian President Volodymyr Zelenskiy if he committed to investigations involving Trump's Democratic rivals. Sondland, a Trump donor, was one of several diplomats who advised the Ukrainian leadership about how to carry out Trump's demands after his July phone call with Zelenskiy. In the call, Trump asked the Kyiv leader for "a favor" -- that Ukraine investigate one of Trump's top Democratic challengers, former Vice President Joe Biden, and the business dealings of his son, Hunter Biden. According to a U.S. intelligence whistleblower, Sondland and other diplomats exchanged a series of text messages in which the diplomats wondered why roughly $400 million in aid to Ukraine was frozen. .