Even in this time of intense GOP concern over immigration, Republicans support the idea that the U.S. “should take in Ukrainian refugees” by 64% to 36%. Overall support for the notion is 74% to 26%.

These numbers suggest that Republican members of Congress, candidates and commentators echoing Mr. Trump’s isolationism and Kremlin apologetics are out of sync with GOP voters. Rep. Madison Cawthorn (R., N.C.) didn’t reflect Republican opinion when he called Mr. Zelensky “a thug” and Ukraine’s government “incredibly evil” last Saturday at a town hall in Asheville, N.C. Ohio Senate candidate J.D. Vance was way out of touch with GOP voters when he declared in an interview, “I gotta be honest with you, I don’t really care what happens to Ukraine one way or another.” He later backtracked, perhaps having realized he’d offended Ohio’s large Ukrainian-American community as well as plenty of Reaganite Republicans.

The sheer aggression and promiscuous brutality of Mr. Putin, combined with the awe-inspiring courage of Mr. Zelensky, the Ukrainian military and the Ukrainian people, have provided the U.S. a clarifying moment. “Come home, America” turns out to be as unwise a foreign-policy doctrine in 2022 as it was when Democrat George McGovern coined the phrase in 1972. It’s much clearer now than a month ago that when the U.S. withdraws from the world, the world suffers—and so does America.