A defining feature of liberal democracy is the respect for and protection of core civil liberties. Yet, major crises, such as wars, natural disasters and pandemics, can provide a pretext to undermine liberal democratic norms. This raises questions of whether citizens are willing to support policies that violate their civil liberties in a crisis and whether some individuals are more likely to a support such encroachments. We conducted a series well-powered preregistered conjoint and vignette experiments in the US and UK during the first wave of the COVID-19 pandemic. We find that people’s attitudes are relatively malleable and that endorsements by an in-group party and trusted experts can shift support for measures that erode civil liberties. However, the evidence also reveals resistance to certain illiberal policy measures, including banning protests and indefinitely postponing elections. This indicates the presence of liberal democratic norms, even when partisan elites promote illiberal policies.