The attack on its Capitol on January 6, 2021, was an unprecedented event in the history of the United States. It was made more peculiar by the fact that the conspiracy theory (CT) that the election had been fraudulent was spread by the outgoing president, Donald Trump, too. The purpose of this research is to show that CTs are suitable political tools for populists, as both are based on the division of society and appeal to alienated, dissatisfied groups. The main conclusion of the research is that populism and CTs spread because of political polarization, which, in turn, these narratives themselves deepen. For this reason, the populist use of conspiracy theories is almost inevitable.