President Donald Trump on Thursday renewed doubts over his commitment to the NATO alliance, saying countries that are not spending adequately on their militaries do not deserve defense.

"If they don't pay, I'm not going to defend them," he told reporters in the Oval Office.

Trump has frequently questioned whether the United States -- by far the biggest military in the transatlantic alliance and ultimate guarantor of Europe's security since World War II -- should continue its central role in NATO.

The Republican, who began........

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