The new Republican litmus test is very dangerous
David Frum writes: War with Mexico? It’s on the 2024 ballot, at least if you believe the campaign rhetoric of more and more Republican candidates. In January, two Republican House members introduced a bill to authorize the use of military force inside Mexico. They were not know-nothings from the fringes of the MAGA caucus. One was Dan Crenshaw of Texas, a former Navy Seal who received a master’s degree from Harvard’s Kennedy School of Government. The other was Mike Waltz…