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Moreover, France, Britain and Germany appear far more solidly committed to the Iran nuclear deal than are Trump and Congress.

A U.S.-NATO collision could come here, and soon.

The Iranians have signed on to purchase 100 Airbus aircraft and 80 commercial airliners from Boeing. If the Republicans impose new sanctions on Iran, or scupper the Boeing deal, Europe would have to decide whether to abandon the Airbus sales, or deliver the planes and perhaps take over the Boeing contract. That could bring a crisis.

And any U.S. confrontation with Iran, pressed upon us by Saudis, Israelis and Sunni Arabs could find Europeans bailing out wholesale on the next U.S. war in the Middle East.

Trump also seems less committed to the sanctions on Russia for its reannexation of Ukraine and support of pro-Russian rebels in the Donbass than does NATO Europe or Congress.

From his rough remarks, Trump sees the Europeans as freeloaders on U.S. defense, laggards on their NATO contributions, and mercantilists who craft policies to run endless trade surpluses at our expense, especially the Germans who are “bad, very bad.”

The European half of Trump’s trip should be taken as a fire-bell-in-the-night warning: Shape up, Europe, or you may find yourselves on your own when it comes to the defense of your continent.

For we Americans have had about enough.