Secretary of State Marco Rubio told reporters he would speak with the officials after days of mounting threats from the Trump administration to take Greenland, a semiautonomous Danish territory.

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Analysts say the Cold War agreement allows the president to increase the American military presence almost at will.

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President Trump has repeated his interest in taking the semiautonomous Danish territory, citing U.S. national security. Denmark’s leader says such a move would be the end of NATO.

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