https://www.justsecurity.org/66972/a-whos-who-of-ukraine-witnesses/
"The list of witnesses complying with congressional subpoenas and thereby defying the White House directive not to cooperate with the House impeachment inquiry seems to grow longer by the day. Senior officials from the State Department, the Pentagon and the National Security Council have all given depositions, telling remarkably similar stories about how the Trump administration’s Ukraine policy shifted from what was best for the United States to what was best for Donald Trump and his bid for reelection."
