Let’s start with the obvious examples. Years ago (even months ago) it would have been absurd to imagine “law and order” Republicans souring on the FBI; or that the party of Reagan and Bush would turn on the NFL, America’s most orgiastically patriotic sport.

But that’s precisely what’s happened. In 2014, about 60 percent of both Republicans and Democrats said the FBI was doing an "excellent" or "good" job. Last year, their views forked: Republican approval of the agency fell by about 10 points, while Democratic opinion improved by a similar margin. The same thing happened with football: Less than 20 percent of Republicans said they had unfavorable views of the NFL in the summer of 2017. But their disapproval had more than tripled by October, after Trump blasted players for kneeling to protest police violence during the national anthem. One analysis determined that, following the anthem protests, the NFL—a $13 billion industry that is the linchpin of the massive pay-TV ecosystem—became one of the most polarizing brands in the country.

Trump’s words don’t just reshape Republican attitudes. Just as often they empower and radicalize his critics. One could say that, despite his fondness for gilded touches, Trump evinces not a Midas touch, but a Moses touch—an extraordinary talent for planting a stake in the ground and dividing the landscape before him.

This Moses effect is most evident when it comes to Russia and immigration. In mid-2016, 20 percent of both Republicans and Democrats considered Russia an “ally” or “friendly.” One year later, Republicans were more than twice as likely as Democrats to say the same. Immigration had for years been a marginal political topic, especially when compared with issues like jobs and terrorism. But Trump effectively recast immigration as a question of American identity and national security. The construction of a wall along the Mexican border, once a fringey scheme, became the centerpiece of the GOP presidential candidate’s agenda. Today, three-quarters of Trump supporters say that “building the wall” should be the highest priority of his presidency. And yet, because Democrats have become more pro-immigrant under Trump, a record-high share of Americans now say "immigrants strengthen the country.” Essentially, Trump has popularized the liberal position on immigration while radicalizing the right’s.

It's tempting to downplay the power of Trump's words by saying their influence is “merely” shifting public opinion. But that's not quite right. First, there’s nothing subtle about Republican voters clutching nativism, the far-right right clutching Nazism, or Democratic voters radicalizing in defiance of the president. The devoted rank-and-file play an outsized role in state primaries. Trump’s “mere” words could starve his party of moderate legislators, while encouraging Democratic candidates to embrace more liberal positions to distinguish themselves as distinctly anti-Trump. Second, Trump’s rhetorical posture has some real policy implications. Though he hasn’t yet signed any major legislation on immigration, his harsh stance on undocumented workers empowered the Immigration and Customs Enforcement agency to increase arrests by 40 percent in his first year, often to shocking effect. And his constant disparagement of experts who refuse to parrot his policies has sucked the talent out of several government agencies, notably the State Department.