Democrats are unfazed, even giddy about a possible 2024 rematch between President Joe Biden and Donald Trump. But the prospect of facing upstart Florida Republican Gov. Ron DeSantis is prompting whispers of angst within Democratic circles.

While Biden advisers and allies haven’t yet settled on a strategy to thwart DeSantis, the White House hasn’t missed an opportunity to knock him in an effort to weaken him before he can announce a presidential bid, according to conversations with Biden advisers and Democratic strategists.

Democrats worry that DeSantis, who presides over a large, diverse and former swing state, could appeal to possible Biden voters, those who would otherwise lean Republican, but were repelled by Trump’s baggage, the advisers and strategists said.