“We have seen unimaginable violence taken out in the name of religion, acts of wanton horror against religious minorities, horrors of a scale that defy description,” Trump said Thursday at the National Prayer Breakfast, an annual event where political leaders usually deliver speeches about their faith-based struggles and redemptions.

“Terrorism is a fundamental threat to religious freedom,” he said. “It must be stopped and it will be stopped. It may not be pretty for a little while, it will be stopped.”

In the same speech, Trump reiterated a campaign promise to gut the tax code of provisions that prevent religious groups from campaigning for or against a political candidate.

“I will get rid of and totally destroy the Johnson Amendment,” he said of the law, which takes its name from President Lyndon Johnson, who saw through its passage as a Texas senator, “and allow our representatives of faith to speak freely and without fear of retribution.”

Trump named only one antagonist, the Islamic State, or ISIS, in a broad indictment of terrorist threats, including against Jews, and called for a united front to crush the “enemies.”

“All nations have a moral obligation to speak out against such violence, all nations have a duty to work together to confront it and to confront it viciously if we have to,” he said.

“We have seen peace-loving Muslims brutalized, victimized, murdered and oppressed by ISIS killers,” he said. “We have seen threats of extermination against the Jewish people.”

Trump was graphic and detailed in his depiction of the perceived threat, deviating from his prepared marks to describe the way ISIS decapitates captives. He described it three times, miming it with his right hand slicing across the air.

“We have seen a campaign of ISIS and genocide against Christians where they cut off heads, not since the Middle Ages have we seen that, we haven’t seen that, the cutting off heads, now they cut off the heads, they drown people in cages,” the president said. “Haven’t seen this, haven’t seen this.”

Trump said these concerns were behind his executive order last Friday to ban entry for 90 days to travelers from seven predominantly Muslim nations. The order has created chaotic scenes at airports across the world as officials attempt to assess who is and is not affected by the ban. It also banned entry to refugees for 120 days and barred Syrian refugees indefinitely.

“There are those who would seek to enter our country for the purpose of spreading violence or oppressing other people based upon their faith and lifestyle,” he said. “We will not allow a beachhead of intolerance to spread in our nation.”

Most major Jewish groups criticized the order, saying it appeared to target individuals based on their religion.

Most terrorist attacks in recent years have been homegrown and not committed by recent immigrants. Those committed by visitors – most prominent among them the 9/11 attacks in 2001 – were carried out for the most part by people whose origin was in countries not on the ban list.

Trump suggested that America would seek immigrants who had a cultural affinity with the United States.

“You look all over the world and you see what’s happening,” he said. “We will develop a system to help ensure that those who enter our country fully embrace our values of religious and personal liberty and they reject any form of oppression and discrimination.

“We want people to come into our nation, but we want people who love us and love our values, not people who hate us and hate our values.”

Trump was jovial during much of the speech, mocking Arnold Schwarzenegger, his successor as the host of the NBC reality TV show “The Apprentice.”

He only briefly deferred to the tradition of speakers at the prayer breakfast, a 64-year old institution run by a secretive Christian group, The Fellowship Foundation, of describing their religious awakening. He said he was brought up in a “churched” family.

But he threw red meat to the audience in repeating his campaign pledge to remove from the tax code provisions denying tax-exempt status to religious groups that endorse or oppose political candidates..

There is already wide leeway under the existing tax code for religious leaders to speak to political issues; removing the provision would allow them to endorse candidates. An array of Jewish groups, among them those representing the Reform movement, endorses the church-state separations embedded in the law.

Trump’s pledge came as Republicans in the U.S. House of Representatives and the Senate introduced legislation this week to loosen the tax code to allow tax-exempt groups to more fully involve themselves in political campaigns.

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