The State Department’s top official for arms control is leaving, Secretary of State Mike Pompeo Michael (Mike) Richard PompeoWatchdog confirms State Dept. canceled award for journalist who criticized Trump Trump's push for win with Sudan amps up pressure on Congress Putin nominated for Nobel Peace Prize MORE announced Friday.

“Under Secretary for Arms Control and International Security Andrea Thompson is a dedicated public servant who brought over 25 years of military experience to her role at the State Department,” Pompeo said in a statement.

“Her wealth of knowledge, experience, and leadership skills will be missed,” he added. “I thank her for her commitment to the State Department’s mission and for her decades of service to the United States of America. I wish her all the best in her future endeavors.”

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The statement provided no reason for Thompson's departure.

She was sworn in as under secretary of State in June 2018. Prior to that, she served as Vice President Pence’s national security adviser.

Over the summer, Thompson came under scrutiny after The Washington Post reported that she failed to disclose during her confirmation process personal and financial ties with a GOP operative who dated convicted Russian agent Maria Butina Maria ButinaTreasury adviser pleads guilty to making unauthorized disclosures in case involving Manafort Recently jailed Maria Butina rewarded with new show on Russia Today Russia offers Maria Butina a job at human rights commission MORE.

As the department’s top arms control official, Thompson had a lead role as the Trump administration withdrew from the 1987 Intermediate-range Nuclear Forces Treaty with Russia.

The treaty, which the United States withdrew from in August over alleged Russian violations, banned both countries from having nuclear and conventional ground-launched ballistic and cruise missiles with ranges between 500 and 5,500 kilometers.

Thompson also clashed with lawmakers in both parties. During a Senate Foreign Relations Committee hearing on arms control in May, ranking member Bob Menendez Robert (Bob) MenendezWatchdog confirms State Dept. canceled award for journalist who criticized Trump Kasie Hunt to host lead-in show for MSNBC's 'Morning Joe' Senators ask for removal of tariffs on EU food, wine, spirits: report MORE (D-N.J.) blasted her for dodging questions, saying it showed “disdain” for Congress.

At the same hearing, she clashed with Sen. Ted Cruz Rafael (Ted) Edward CruzCrenshaw looms large as Democrats look to flip Texas House seat SCOTUS confirmation in the last month of a close election? Ugly The Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' MORE (R-Texas) as he grilled her on the administration’s decision to extend some nuclear waivers for Iran.