Mary McCord, the Department of Justice’s acting Assistant Attorney General for National Security who is leading the investigation into possible ties between the Trump campaign and Russia, is stepping down from her post.

McCord will officially leave her position next month, the Associated Press reports. According to the AP, she is leaving to pursue “other opportunities.”

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McCord joined the National Security division of the Justice Department in 2014, during the Obama administration, and became acting Assistant Attorney General of the Department in 2016, following the resignation of John Carlin. Previously, she served as the Criminal Division Chief in the Washington D.C. U.S. attorney’s office for 20 years.

McCord’s departure will add to the relatively lengthy list of vacancies that already exist at the Department of Justice. In March, Attorney General Jeff Sessions ordered the resignation of the 46 U.S. attorneys remaining from the Obama administration. Sessions has not replaced them, and his own top deputies are awaiting Senate confirmation.

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