A former adviser to Secretary of State Mike Pompeo spoke on Oct. 16 to House lawmakers conducting the impeachment inquiry, which is centered on allegations that President Donald Trump pressured Ukraine to investigate former Vice President Joe Biden. The former adviser, Michael McKinley, is the latest witness to testify behind closed doors as Republicans continue to criticize the secrecy of the process and the White House refuses to cooperate unless Democrats vote to formally launch the inquiry. Lawmakers are working to determine whether Trumps request to Ukrainian President Volodymyr Zelensky to investigate Biden amounted to an abuse of power for political gain against an election opponent. An anonymous whistleblower triggered the inquiry by disclosing details of the July 25 call between Trump and Zelensky to Congress. McKinley served as ambassador to Brazil and Afghanistan. While little is known publicly about the testimonies occurring behind closed doors, a congressional Republic..