Former President Donald Trump leads President Joe Biden by 43 points among unvaccinated voters in a potential 2024 rematch, according to a new poll, which found a partisan divide being driven by vaccine willingness.

Though most Americans—regardless of political affiliation—have been fully vaccinated, the YouGov/Yahoo News poll reported greater vaccine hesitancy among Republicans than Democrats or independents.

Fifty-eight percent of voters who are not fully vaccinated plan to vote for Trump should he run for president again in 2024—opposed to only 15 percent who plan to vote for Biden, according to the poll. Meanwhile, another 27 percent of unvaccinated people said they are not sure who they’d vote for.