This study investigates how diversity claims may cause labor market sorting by political partisanship. In a field experiment conducted in partnership with a U.S. software company, we show that diversity claims are disproportionately unattractive to Republican job seekers. Our follow-up survey experiment suggests that this decreased attraction is driven by not only taste-based (i.e., ideological misalignment) but also statistical mechanisms (i.e., inferences about what diversity claims signal regarding unobservable employer characteristics). Notably, while previous studies have demonstrated that diversity claims lower expectations of discrimination for women and people of color, we find that these claims can, in fact, raise expectations of discrimination (while also reducing expectations of meritocracy) for workers on the political right. Overall, our findings imply that efforts to improve gender or racial diversity through diversity claims may create a more homogeneous workplace in terms of political partisanship.