Trump’s threat to annex an autonomous part of Denmark has plunged NATO into an unprecedented situation: An alliance based on collective defense now faces the prospect that one member might attack another.

U.S. President Donald Trump has repeatedly threatened Greenland and says Washington must take control of the strategically located island.

European officials were stunned that President Trump restated his desire for Greenland after a yearlong effort to dissuade him, according to diplomats and others.

In addition to political resistance, Greenland’s mineral riches and strategic position would come at a steep cost for the U.S.

The president's public remarks came three days after the White House press secretary said using the U.S. military is "always an option" for acquiring the Danish territory.

Greenland is 836,000 square miles of largely frozen ground northeast of Canada. So why does the White House say it "should be part of the United States"?

Greenland's parliament will bring forward a meeting to discuss its response to U.S. threats to take control of the Arctic island, the leaders of the five political parties in the Greenlandic assembly said in a joint statement.

Trump allies have cited the island's continued role in missile defense infrastructure, accusing Denmark of leaving it vulnerable to potential Russian and Chinese influence.