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. Schumer Asks Defense Watchdog to Probe Trump Impeachment Retaliation Ken Bredemeier WASHINGTON - U.S. Senate Democratic leader Chuck Schumer asked the Defense Department watchdog on Monday to investigate what he said was "shameful" and "Illegal" retaliation by President Donald Trump against a witness who testified against him at last year's impeachment hearings. Schumer asked 74 inspectors general throughout the government to probe any retaliation against federal workers who report Trump administration misconduct, but singled out the president's dismissal of Army Lt. Col. Alexander Vindman as a Ukraine expert at the National Security Council in the White House. Vindman testified against Trump at House of Representatives impeachment hearings leading up to approval of two articles of impeachment, although Trump last week was acquitted after a three-week trial in the Senate. A short time before dismissing Vindman, Trump was asked about his status, responding, "I'm not happy with him. You think I'm supposed to be happy with him? I'm not." Vindman testified about concerns he had about Trump's request last July to Ukrainian President Volodymyr Zelenskiy to investigate one of Trump's chief 2020 Democratic challengers, former Vice President Joe Biden, his son Hunter Biden's lucrative work for a Ukrainian natural gas company and a debunked theory that Ukraine meddled in the 2016 U.S. election to undermine Trump's campaign. Trump's request came at the same time he was temporarily blocking release of $391 million in military aid Kyiv wanted to help fight pro-Russian separatists in eastern Ukraine. .