WASHINGTON U.S. Republican presidential front-runner Donald Trump on Sunday doubled down on his criticism of NATO, a cornerstone of U.S. foreign policy for decades, and called for the alliance's overhaul days before world leaders convene in Washington.
President Barack Obama will host the Nuclear Security Summit on Thursday and Friday with 56 delegations in attendance. While preventing nuclear terrorism will headline the discussions, Trump's views could be a topic as well, particularly behind the scenes.
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