Vice President JD Vance gave a speech recently that deserved more attention than it got. Accepting an award at a right-wing think tank, he argued that there’s a fundamental brokenness in how we define who is an American. He explained that this is the root of many of our country’s problems: a national identity that has become too broad.

That was also a core idea of the 2018 book “The Virtue of Nationalism,” which caused a sensation on the right. Its author, the Israeli political theorist Yoram Hazony, went on to build a movement. For years, he has hosted NatCon — short for National Conservatism — conferences. Those events have featured speakers like Marco Rubio, who is now the secretary of state, and Senator Josh Hawley. And one of the most reliable speakers, year after year, has been Vance.

I wanted to talk to Hazony. What exactly is his argument, his worldview? And are the Trump administration’s policies putting it into practice?

Mentioned:

JD Vance’s speech at The Claremont Institute

Book Recommendations:

The Demon in Democracy by Ryszard Legutko

The Strategy of Denial by Elbridge Colby

Israel and Civilization by Josh Hammer

Thoughts? Guest suggestions? Email us at [email protected].

You can find the transcript and more episodes of “The Ezra Klein Show” at nytimes.com/ezra-klein-podcast. Book recommendations from all our guests are listed at https://www.nytimes.com/article/ezra-klein-show-book-recs.html

This episode of “The Ezra Klein Show” was produced by Elias Isquith. Fact-checking by Will Peischel. Our senior engineer is Jeff Geld, with additional mixing by Aman Sahota. Our executive producer is Claire Gordon. The show’s production team also includes Marie Cascione, Annie Galvin, Michelle Harris, Rollin Hu, Marina King, Jan Kobal, Kristin Lin and Jack McCordick. Original music by Pat McCusker. Audience strategy by Kristina Samulewski and Shannon Busta. The director of New York Times Opinion Audio is Annie-Rose Strasser.

Unlock full access to New York Times podcasts and explore everything from politics to pop culture. Subscribe today at nytimes.com/podcasts or on Apple Podcasts and Spotify.