Jim O’Neill, a top deputy to Health Secretary Robert F. Kennedy Jr., will serve as acting director of the Centers for Disease Control and Prevention, according to an administration official who requested anonymity to discuss a personnel change that has not been formally announced.

The director of the nation’s top public health agency, Susan Monarez, was fired by President Donald Trump late Wednesday because she wasn’t “aligned with the president’s mission” and refused to resign, according to the White House press secretary. Monarez’s lawyers said she was targeted for standing up for science.

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