The open racism and xenophobia that have characterized Donald Trump’s presidential campaign, and perhaps provided much of its appeal, has been alarming. For a growing number of people, Trump’s rhetoric is a sign of something deeper and more frightening: the growth of a fascist movement in the United States.

Ohio governor John Kasich — one of Trump’s many rivals for the Republican nomination — produced an anti-Trump video that paraphrases Protestant theologian Dietrich Bonhoeffer’s warning about the Nazis.

For many other commentators, as well, the violence Trump supporters have directed at critics during campaign rallies, along with the candidate’s call for banning Muslims from the United States, are further confirmation that Trump is a Nazi. In the last Democratic presidential debate, former Maryland governor and presidential candidate Martin O’Malley denounced Trump as a “fascist demagogue.”