The success of a key NATO summit is in doubt after Spain rejects a big hike in defense spending

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FILE- President Donald Trump, center, stops to talk with Spanish Prime Minister Pedro Sanchez, left, and Turkey's President Recep Tayyip Erdogan, right, as they attend a meeting of the North Atlantic Council during a summit of heads of state and government at NATO headquarters in Brussels on July 11, 2018. (AP Photo/Pablo Martinez Monsivais, Pool, File)