(NEXSTAR) -- In a fiery hearing on Capitol Hill Wednesday, the former director of the Centers for Disease Control and Prevention said she was fired for supporting scientific integrity when it comes to vaccines.

Susan Monarez served 29 days in the role before she says the president fired her. Monarez says she clashed with HHS Secretary Robert F. Kennedy Jr. for refusing to pre-approve vaccine recommendations without evidence and dismiss scientists without cause.

"If I am put in a position of having to say, 'I will cede scientific integrity to retain my job,' then I'm not the right person for the position," Monarez said.

Monarez testified before Senators alongside the CDC's former Chief Medical Officer Debra Houry. On Wednesday, Houry said she resigned because she felt leaders at the CDC

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