ABSTRACT In recent decades, the discussion of terrorist threat in the United States has focused almost exclusively on radical Islam. Now, progressive politicians increasingly talk about white supremacy as a form of terrorism. We explore reactions to this new rhetoric using two survey experiments, in which non-Hispanic white respondents are exposed to real tweets of Democratic and Republican politicians discussing white supremacy and radical Islam as security threats. We formulate two alternative expectations: after seeing messages from Democratic politicians linking white supremacy to terrorism, whites may either diverge in their assessments of Republicans’ anti-Muslim appeals depending on their own partisanship or they may uniformly rate anti-Muslim rhetoric as more acceptable. Both experiments show significant increases in the perceived acceptability of anti-Muslim appeals when they are presented after messages about white supremacy, and these results are driven by white Democrats. Our results highlight the potential side effects of political communication about terrorism.