The border-state congressman vying for a promotion in Arizona has been campaigning on the issue for months, focusing on it in a way most Democrats haven't.
Trump posted on X today for the second time since Musk reinstated his account in 2022. He had been kicked off the platform, then known as Twitter, days after the Jan. 6 Capitol riot.
A Democratic-aligned group had sued Kennedy, who resides in California, over the New York address he claimed as his residence on ballot access petition forms.