Republican lawmakers and Jewish organizations denounced Tucker Carlson, an ally of President Trump, for hosting the outspoken white supremacist Nick Fuentes on his podcast this week, and criticized other conservative figures who defended the interview. Senators Ted Cruz and Mitch McConnell criticized Mr. Carlson, the far-right commentator who served as a top surrogate for Mr. Trump’s re-election campaign and spoke at the party’s national convention last year, for hosting Mr. Fuentes, who is openly antisemitic and had previously dined with Mr. Trump in 2022. The episode underscored a rift among leading conservatives over associations with incendiary but influential figures on...