Pompeo's de facto chief of staff, Michael McKinley, announced his retirement after a almost four-decade career as an American diplomat.
A career foreign service officer who served as a top adviser to Secretary of State Mike Pompeo has resigned, adding to the tumult in the State Department over the Trump administration's handling of Ukraine and treatment of diplomats.
He said he was "leaving the Department to pursue other opportunities, wherever they may lead".
Secretary of State Mike Pompeo spoke with Gray TV's Greta Van Susteren this week amid Turkey's invasion of Syria, the arrests of Rudy Giuliani's associates and an impeachment inquiry on the president.
Whereas McKinley has no longer been without delay interested with Ukraine, he has served as a conduit between Pompeo's office and profession workers, in line with the Washington Publish, which first reported his resignation Thursday evening. Pompeo was expected to issue a statement Friday about his departure, the newspaper reported.
House Democrats have issued a subpoena to Pompeo for documents as part of their probe, which centers on a July 25 call Trump made to Ukrainian President Volodymyr Zelenskiy in which he pressed for an investigation into former U.S. Vice President Joe Biden, a leading Democrat seeking the party's nomination in the 2020 presidential election.
Among the many issues on which he played a role, McKinley has been closely involved in administration policy on Venezuela, Mexico, Southeast Asia and Afghanistan, where last month President Donald Trump abruptly canceled US peace negotiations with the Taliban that both sides had said were near an agreement.
Asked about McKinley's departure in an interview in Nashville on Friday, Pompeo said his adviser "wanted to go on and begin the next phase of his life".
Fortuitous timing resulted in The Washington Post publishing a bombshell report minutes before Intelligence Chair Adam Schiff (D-CA) was interviewed on "The Rachel Maddow Show".
Concern has been especially high for Marie Yovanovitch, the then-U.S. ambassador to Ukraine whom Pompeo recalled from her post when a right-wing media campaign accused her of disloyalty.
Now a fellow at Georgetown University on leave from the State Department, Yovonavitch is scheduled to give a deposition to investigating committees on Friday.