Tucker Carlson, the former Fox News star turned podcaster, has come under fire for hosting a Holocaust revisionist on his show, who posited that it was Winston Churchill, not Adolf Hitler, who was the “chief villain” of World War II — drawing a rebuke from conservative lawmakers as well as the White House. The comments were made by the podcaster Darryl Cooper on Mr. Carlson’s show “Tucker on X” on the social media platform. Mr. Carlson, who has hosted the show since Fox severed ties with him in 2023, introduced Mr. Cooper as “the most important popular historian working in...