May is chock-full of primary elections, and they are starting to provide a picture of how deep the G.O.P. is entrenched in Trumpism. J.D. Vance, the 37-year-old venture capitalist and author of the acclaimed memoir “Hillbilly Elegy,” won the Republican Senate primary in Ohio — with the endorsement of Donald Trump. The rise of Vance paints a telling portrait of how the G.O.P. is evolving in its appeal to its conservative base. Vance eagerly sought Trump’s endorsement and praise. Does it mean that the party is becoming a “populism of tribal loyalty,” as suggested by one of today’s guests? Today on “The Argument,” host Jane Coaston wants to know what this month’s Republican primary elections can actually tell us about the future of the G.O.P. and if it signals more Trump in 2024. She is joined two conservative writers, David French and Christopher Caldwell. French is a senior editor of “The Dispatch” and a contributing writer at The Atlantic. Caldwell is a contributing writer for New York Times Opinion. “I don’t think anyone disputes that there’s a wide open lane for populist incitement,” French says. “I think the issue with J.D. Vance and the issue with the Republican Party in general is this move that says, we’re going to indulge it. We’re going to stoke it.”