Roberta Jacobson, the White House’s southern border czar, will step down from her post at the end of the month in a surprising move but one the administration said was pre-planned.

Jacobson, who was U.S. ambassador to Mexico under former President Obama, agreed to join the administration as a border coordinator for President Biden’s first 100 days in office, a period ending later this month.

“Ambassador Roberta Jacobson’s leadership in serving as the Special Assistant to the President and Coordinator for the Southwest Border at the National Security Council has been an invaluable contribution to the Biden-Harris Administration and to the United States,” White House national security adviser Jake Sullivan said in a statement announcing her departure.

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Sullivan said Jacobson will leave her post “having shaped our relationship with Mexico as an equal partner, having launched our renewed efforts with the Northern Triangle nations of El Salvador, Guatemala, and Honduras, and having underscored this Administration’s commitment to reenergizing the U.S. immigration system.”

Read more at The Hill.