WASHINGTON — Health and Human Services Secretary Robert F. Kennedy Jr. vehemently defended his actions on vaccines and other public health issues under questioning by both Republican and Democratic senators during a contentious hearing Thursday.

Kennedy, confirmed on a mostly party-line vote earlier this year, repeatedly justified firing everyone on an influential vaccine advisory panel, as well as the president’s decision to remove a Centers for Disease Control and Prevention director who’d served for less than a month after confirmation by the Senate.

“In your confirmation hearings, you promised to uphold the highest standards for vaccines. Since then, I’ve grown deeply concerned,” said Senate Majority Whip John Barrasso, R-Wyo. “The public has seen measles outbreaks. Leadership of the

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