Republican senators are unmoved by Tucker Carlson’s relentless warpath against support for Ukraine — even as it widens an existing rift in their party. The Fox News prime time host and others on the far-right have excused and even rationalized Russia’s aggression toward Ukraine and downplayed its relevance to U.S. national security. And while GOP senators are shrugging off his name-and-shame campaign, Carlson’s views are permeating the GOP base in a way that could undermine Republicans’ efforts to emphasize cross-party unity as they seek to deter a Russian invasion of Ukraine.