Bill Taylor, the top U.S. diplomat for Ukraine who testified before the House in the impeachment inquiry, plans to leave his post by the end of the year, a person familiar with his plans told Fox News on Tuesday.

Under the terms of the Vacancies Act, Taylor could have remained in his position until Jan. 8 -- and even longer under his current State Department contract -- but will hand over his responsibilities to the Deputy Chief of Mission on Jan. 1 and leave Kiev the following day.

Taylor’s future plans with the State Department were not immediately clear, nor was it clear who Taylor’s permanent replacement would be.

Taylor was serving as the acting ambassador, having never been formally confirmed by the Senate. Ukraine has been without a permanent ambassador since Marie Yovanovitch was fired from the position in May.

DEM REP. MCGOVERN SAYS IMPEACHMENT INTENDED TO STOP ‘CRIME IN PROGRESS,’ PREVENT ‘RIGGING’ OF 2020 VOTE

Taylor, a Vietnam War veteran who previously served as the U.S. Ambassador to Ukraine under President George Bush, was tapped by Secretary of State Mike Pompeo to replace Yovanovitch in June.

Taylor made headlines last month while testifying before the House Intelligence Committee regarding his knowledge of President Trump’s dealings with Ukraine that have set in motion an impeachment investigation.

In September, Taylor texted U.S. Ambassador to the E.U. Gordon Sondland saying it was “crazy to withhold security assistance for help with a political campaign.”

CLICK HERE TO GET THE FOX NEWS APP

Hours later, Sondland replied: “The President has been crystal clear: no quid pro quo’s of any kind.”