WASHINGTON — Health secretary Robert F. Kennedy Jr.’s aggressive moves to change U.S. vaccine policy — adopted by leaders at other federal health agencies — may be putting him at odds with President Trump himself.

Now Kennedy’s allies are rallying to support him, believing the coming weeks and months will be key to their efforts toward cementing the Make America Healthy Again agenda in Washington.

The latest flareup centers on vaccine mandates. On Friday, asked about plans by Florida state officials to phase out all childhood vaccine mandates there, Trump struck a note of caution.

“I think we have to be very careful,” he told reporters in the Oval Office.

“Look, you have vaccines that work. They — pure and simple — work,” he added, differentiating between vaccines he deems “controver

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