A top anti-abortion advocate at the Department of Health and Human Services (HHS) abruptly resigned Friday evening.

Teresa Manning, the deputy assistant secretary for population affairs, left after less than a year on the job.

A department spokeswoman did not give a reason for her resignation, but said HHS "would like to thank her for her service to this administration and the American people."

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One of Manning's primary duties was overseeing the Title X federal planning programs, which funds clinics providing contraception and preventive health services.

The program is running months behind in the application process for 2018. Title X clinics had been expecting changes to the program, like restrictions to facilities that provide abortions.

Valerie Huber, who has been serving as the chief of staff for the Office of the Assistant Secretary of Health, will take over as the interim deputy assistant secretary for population affairs, HHS announced.

Manning previously worked for the National Right to Life Committee and the conservative Family Research Council. Abortion rights advocates have been critical of her previous statements about abortion and birth control.