Denmark, Norway, Sweden, France, Germany, the United Kingdom, the Netherlands and Finland are casting a united front after Trump threatens tariffs.

The treaty that created NATO did not contemplate an attack by one ally on another. A seizure of Greenland by President Trump would test the endurance of the mutual-defense pact.

NPR's Steve Inskeep asks Kurt Volker, a former U.S. ambassador to NATO, about what critics perceive as the Trump administration's threat to the transatlantic alliance.

Donald Trump’s rhetoric around Greenland has reached an astonishing level of fervour. On Monday, when asked whether the United States would use force to seize the vast Danish Arctic territory, the president replied: “No comment.

US President Donald Trump has given a vague and foreboding reply to a Reporter when asked how far his administration will go to acquire Greenland.

While Europe is pushing back publicly against U.S. President Donald Trump over Greenland, the language appears softer behind the scenes. Trump published a text message on Tuesday that he received from French President Emmanuel Macron,