The US’s top public health agency was plunged into chaos on Wednesday after the Trump administration moved to oust its leader Susan Monarez, sworn in less than a month ago, as her lawyers said she would not resign and that she was being “targeted” for her pro-science stance.

Monarez, the director of the Centers for Disease Control and Prevention (CDC), was ousted on Wednesday evening, according to a statement from Department of Health and Human Services (HHS) that offered no explanation its decision.

“Susan Monarez is no longer director of the Centers for Disease Control and Prevention. We thank her for her dedicated service to the American people,” HHS said in an unsigned statement posted to social media.

Monarez, who was confirmed by the Senate just last month, appeared to have run afoul of Robert F Kennedy Jr, the US health secretary, after she declined to support sweeping changes to US vaccine policies, according to reporting from the Washington Post and the New York Times.