Of all the promises, from quixotic to horrifying, that Donald Trump has made about the next four years, the one that seems least likely to be fulfilled is his vow to “defeat anti-Semitism.” He has nominated a slew of cranks who have dabbled in the oldest conspiracy theory of them all, a belief that Jews control the world.

Over the past decade or so, pernicious lies about Jewish villainy have drifted into the mainstream of American life. That’s a fact Trump acknowledges when he talks about his plans to “defend Jewish citizens in America.” But he tends to focus on the problem at college campuses, which constitutes an incomplete diagnosis. It allows Trump to ignore his own complicity in unleashing the worst wave of anti-Jewish sentiment in generations.

In his first administration, Trump provided rhetorical cover for supporters who blared hateful sentiments—those “very fine people,” Kanye West, and others. This time, he’s placing them in the line of presidential succession. If confirmed, this crew would comprise the highest-ranking collection of White House anti-Semites in generations.

Take Matt Gaetz, Trump’s nominee for attorney general. He is a fierce opponent of the Antisemitism Awareness Act, which would curtail federal funding for institutions of higher education that fail to address the hatred of Jews when it flourishes on their campuses. There are principled reasons for rejecting the bill. But in the course of arguing against it, Gaetz revealed himself. He asserted that the legislation’s definition of anti-Semitism would penalize the belief that the Jews killed Jesus. This wasn’t a point Gaetz made in the spirit of protecting free speech. He fervently believes it himself. “The Bible is clear. There is no myth or controversy on this,” he posted on X. This is the canard from which the whole Western tradition of anti-Semitism flows, a belief officially repudiated by the Catholic Church at the Second Vatican Council nearly 60 years ago.

And it wasn’t a stray expression. In 2018, Gaetz invited Charles Johnson, a notorious figure on the alt-right, to attend the State of the Union address as his guest. Johnson is a textbook example of a Holocaust denier. He insists that only 250,000 Jews died—and only of typhus—during World War II. In a Reddit “Ask Me Anything” session, he wrote that he agreed with a commenter “about Auschwitz and the gas chambers not being real.” When confronted with Johnson’s record, Gaetz admitted that he hadn’t properly vetted Johnson before extending him an invitation. Even so, he told Fox Business that Johnson is “not a holocaust denier.” That defense, given all the evidence about Johnson presented to him, is tantamount to an endorsement.

The essence of conspiracism is the description of the hidden hand, the ubiquity of all-powerful evildoers. That is Robert F. Kennedy Jr.’s overriding intellectual habit. He believes that the CIA killed his uncle, and he attributes autism to vaccines. In 2023, he was caught on video suggesting that COVID-19 might be a bioweapon. Espousing such a theory should be disqualifying for the job of running America’s public-health system. But he went further. He said that the disease was designed to attack Caucasians and Black people. “The people who are most immune are Ashkenazi Jews and Chinese.” (In case it needs saying, this is false.) As a well-practiced conspiracist, he knew to append his theory with a disclaimer, adding, “We don’t know whether it was deliberately targeted or not,” as if he were merely asking an innocent question. And when confronted with his own words, he denied any ill intent: “I haven’t said an anti-Semitic word in my life.”

[Read: The sanewashing of RFK Jr.]

But his insinuation echoed the medieval Christian libel that Jews had poisoned the wells of Europe, unleashing the Black Death. Kennedy’s winking accusation also mimics a strain of white-supremacist pseudoscience, which asserts that Ashkenazi Jews are a distinct race from Caucasians. According to this bizarre, and bizarrely prevalent, theory, that’s what makes Jews so pernicious: They can pass for white people while conspiring to undermine them.

Not so long ago, these sorts of comments would have rendered a nominee unconfirmable—or at least would have necessitated an excruciating apology tour. But anti-Semitism is no longer taboo. And it’s telling that Trump has adopted Elon Musk as a primary adviser, because Musk is a chief culprit in the lifting of that taboo.

When Musk bought Twitter in 2022, he reversed a ban imposed by the company’s previous regime that kept anti-Semites and Holocaust deniers off the platform. Under his ownership, anti-Jewish voices became unavoidable fixtures on the site, broadcasting their bigoted theories without any fear of consequences.

One reason they have little to fear is that Musk has displayed sympathy for their worldview. Like them, he harps on the wickedness of George Soros, whom he once likened to the comic supervillain Magneto, a mutant who plots to wipe out humanity. (Like Soros, Magneto is a Holocaust survivor.) This comparison almost explicitly admits its exaggeration of Jewish nefariousness. And if the thrust of his sentiments wasn’t clear enough, he emphatically endorsed a tweet claiming that “Jewish communities have been pushing … dialectal hatred against whites.”

For a time, Musk refuted his critics by smearing them. He accused the Anti-Defamation League, the nation’s leading Jewish civil-rights group, of orchestrating a campaign to destroy him. Eventually, to fend off an advertiser boycott, he apologized, visited Auschwitz, and called himself “aspirationally Jewish.”

The presence of these conspiracists doesn’t suggest that Trump will pursue policies that provoke Jewish suffering. His support for Israel might even win him the approval of a growing segment of organized Jewry. Instead, the danger posed by his appointees is that their mere presence in high office will make American anti-Semitism even more permissible; they will make conspiracies about Jews socially acceptable. Indeed, that might already have happened. Trump just proposed the most anti-Semitic Cabinet in recent history, and that fact has barely elicited a peep.