Robert F. Kennedy Jr. told supporters on an online organizing call this week that former President Donald J. Trump had “promised” him “control” of the nation’s public health agencies, should Mr. Trump win the election next week.

The Trump campaign, however, would confirm no such commitments.

“President Trump announced a Trump-Vance transition leadership group to initiate the process of preparing for what comes after the election,” Steven Cheung, a campaign spokesman, said in a statement. “But formal discussions of who will serve in a second Trump Administration is premature.”

Mr. Kennedy, who suspended his presidential campaign in August, said in a text message to The New York Times that a video of the call, which circulated on social media Tuesday, was a recording of an internal discussion with campaign workers discussing get-out-the-vote efforts for Mr. Trump.

“I stand ready to help him rid the public health agencies of their pervasive conflicts and corruption and restore their tradition of gold-standard, evidence-based science,” Mr. Kennedy said in a statement.

During his discussions with the Trump campaign before his endorsement, Mr. Kennedy made clear that he wanted to have a significant role in public health oversight. Since then, Mr. Kennedy has spoken openly about his plans to reform the federal health care and agriculture systems, which he and his supporters see as corrupt and dangerous.

Mr. Kennedy, 70, an environmental lawyer and a scion of a storied Democratic family, is a leader of the so-called “medical freedom movement,” which broadly opposes vaccine mandates. The movement gained force during the pandemic and now seems closer than ever to the seat of power.

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