Carlson is a vocal opponent of progressivism and critic of immigration, and has been described as a nationalist. Formerly an economic libertarian, Carlson now supports protectionism. In 2004, he renounced his initial support for the Iraq War, and has since been skeptical of foreign interventions by the U.S. Carlson has promoted conspiracy theories about topics such as immigration, COVID-19, and the 2021 U.S. Capitol attack.