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Tim Morrison, the top Russia official on President Trump's National Security Council, who is scheduled to testify in the impeachment inquiry on Thursday, is expected to leave his White House post imminently, three sources familiar with the plan told NPR.

Morrison, a conservative hawk who has served as the senior director for European and Russian affairs on the National Security Council, will be replaced by Andrew Peek, the deputy assistant secretary of state for Iraq and Iran in the Bureau of Near Eastern Affairs, according to the sources.

Morrison and Peek could not immediately be reached for comment by NPR. The National Security Council declined comment.

Morrison started his job in July, chosen by Trump's former national security adviser, John Bolton, to fill the role when Fiona Hill — another witness in the impeachment inquiry — announced her plans to leave the White House in August.

Morrison is a crucial figure in the House Democratic investigation into whether Trump pressured Ukrainian President Volodymyr Zelenskiy to launch an investigation of a political rival.

Morrison had alerted NSC lawyers about alleged demands being placed on the Ukrainian government to investigate a company where the son of former Vice President Joe Biden sat on the board, according to testimony this month from William Taylor, the top U.S. diplomat in Ukraine.

Taylor testified that Morrison told him that Gordon Sondland, Trump's ambassador to the European Union, had informed a top Ukrainian official that U.S. military aid hinged on Zelenskiy's committing to investigating the firm connected with Biden's son.

An attorney for Morrison said Morrison planned to appear before House investigators on Thursday if subpoenaed.

It was not clear whether Morrison had been asked to leave his job or was departing voluntarily, and NPR could not immediately confirm the exact timing of his departure. His attorney, Barbara Van Gelder, would not discuss Morrison's job status or plans.