One month into Operation Epic Fury against the Islamic Republic of Iran, a long-overdue conversation has finally broken into the open: What, exactly, is the enduring rationale for NATO? For decades, this question has been treated in Washington foreign policy circles as heretical. But it isn't. And to their credit, President Donald Trump and Secretary of State Marco Rubio are now saying so plainly.

As Trump recently put it, "They haven't been friends when we needed them. We've never asked them for much. ... It's a one-way street." Rubio has been similarly blunt: "If NATO is just about us defending Europe if they're attacked but then denying us basing rights when we need them, that's not a very good arrangement. ... So all that's going to have to be reexamined."

At best, America's European "allies" have spent decades free-riding on the U.S. security umbrella. Despite repeated commitments to meet baseline defense spending targets, many NATO members still under-invest in their militaries and outsource their national defense to American taxpayers. The imbalance is staggering: The United States accounts for the overwhelming majority of NATO's military capabilities, logistics and strategic lift. Overall, American taxpayers contribute about 60 percent of total spending on NATO defense.

At worst, some of these same European allies actively undermine U.S. operations at critical........

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