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... In a Congressional hearing Tuesday, Kennedy refused to commit to supporting evidence-based vaccine policy from the next director of the Centers for Disease Control and Prevention. At the same time, he refused to say that he wouldn't interfere with the agency's recommendations.

Last week, Trump nominated Erica Schwartz to be the next CDC director, a role that requires Senate confirmation. Schwartz is a respected physician and former public health official who has championed the use of vaccines during her distinguished career. Outside experts were pleasantly surprised by the uncontroversial choice but wary of her ability to implement evidence-based policy under Kennedy.

Last year, Kennedy -- who has no medical, scientific, or public health background -- ousted the previous Senate-confirmed director, Susan Monarez, who was, like Schwartz, a well-qualified and respected pick for the role. Monarez testified that she was pushed out for refusing to rubber-stamp vaccine recommendations from Kennedy's hand-selected anti-vaccine advisors. Monarez lasted as CDC director for just 29 days.

Kennedy's response Tuesday suggested Schwartz could face an equally short tenure.

His answer came amid an exchange with Rep. Raul Ruiz (D-Calif.) in a hearing of the House Committee on Energy and Commerce. Ruiz asked Kennedy: "If Dr. Schwartz is confirmed, will you commit on the record today to implement whatever vaccine guidance she issues without interference?"

Kennedy replied without hesitation: "I'm not going to make that kind of commitment." ...