Prince Charles has been a long-time supporter of Jewish causes and communities in the U.K. and elsewhere; and on Monday night, he spoke at a fundraiser for the World Jewish Relief charity in London, where the royal—who is first in line to the throne—delivered a message specifically geared to this current moment in world affairs.

Per The Telegraph, Prince Charles described the “indescribable persecution” suffered by Ben Helfgott, a Holocaust survivor who went on to become the captain of the U.K. Olympic weight-lifting team in 1956 and 1960, to the 500 attendees. “The work of World Jewish Relief enables us to rally together to do what we can to support people practically, emotionally and spiritually—particularly at a time when the horrific lessons of the last war seem in increasing danger of being forgotten,” the prince said. “I have always tried to reach across the boundaries of faith and community; to extend a helping hand wherever one might be needed.” Prince Charles also highlighted the specific work of the W.J.R. charity, which was created in 1933 to aid those fleeing Nazi Europe, noting its example of “true compassion and true friendship.”

The prince did not specifically name or mention Donald Trump, who is scheduled to visit his mother, Queen Elizabeth II, later this year (though 1 million people have reportedly already signed a petition asking for the invite to be rescinded). During the Monday night event, Chief Rabbi Ephraim Mirvis denounced President Trump’s travel ban, which he called “totally unacceptable.” Mirvis went on to say, “Not much hope from the United States of America, of all countries, where President Trump appears to have signed an executive order which seems to discriminate against individuals based totally on their religion or their nationality. We as Jews perhaps more than any others know exactly what it is like to be the victims of such discrimination, and it is totally unacceptable.” Mirvis’s comments were reportedly met with a round of applause from the audience.