On Monday, Donald Trump singled out American Muslims as supporting repression and violence, citing a discredited poll from an anti-Muslim group as evidence for imposing border restrictions. But if he is worried about extremist public opinion in the United States, he should take a broader look around.

Research shows that Muslim Americans are less likely to endorse violence against civilians than other religious groups. Moreover, the evidence suggests that a non-trivial minority of Americans of all faiths and backgrounds is willing to endorse the sorts of violence against the government and repressive legal measures that Mr. Trump accused Muslims of disproportionately supporting.

For instance, 27 percent of Americans endorsed violence against the government under some circumstances in a 1998 Pew poll — the same accusation he made against American Muslims. More recent surveys conducted by Nathan Kalmoe of Monmouth College indicate that support for anti-government violence extends for millions of Americans to specific actions such as sending threats to politicians who are “damaging the country” (9 percent), throwing a brick through the window of the “worst politicians” (6 to 13 percent) and fixing “some of the problems citizens have with government” with “a few well-aimed bullets” (5 to 6 percent).