President Donald Trump on Tuesday finally addressed an increase in incidents of anti-Semitism, saying it’s “horrible, and it’s going to stop and has to stop.”

Trump spoke about anti-Semitism while touring the National Museum of African American History and Culture in Washington, D.C., and specifically addressed the recent wave of threats against Jewish community centers across the country.

“The anti-Semitic threats targeting our Jewish community and Jewish community centers are horrible and painful and a very sad reminder of the work that must be done to root out hate and prejudice and evil,” he said after the tour.

Trump’s comments on Tuesday were his clearest denouncement of anti-Semitism yet. When asked during a press conference last week about concerns over an uptick in anti-Semitic acts in the United States, Trump responded by calling himself “the least anti-Semitic person that you’ve ever seen in your entire life.” He noted his daughter Ivanka and her husband, Jared Kushner, were Jewish. And he dismissively claimed the anti-Semitism was coming from “the other side.”

Ivanka Trump, who also joined the tour on Tuesday, took a different approach when she tweeted on Monday about the threats against JCCs. “America is a nation built on the principle of religious tolerance. We must protect our houses of worship & religious centers,” she said.