Denmark and Greenland insist that the mineral-rich island is not for sale, while President Trump has not ruled out taking it by military force even though Denmark is a NATO ally.

Denmark says it will summon the top U.S. diplomat in the country for an explanation following a Wall Street Journal report about the United States stepping up its intelligence gathering on Greenland,

U.S. officials have ordered spy agencies to ramp up efforts to gather intelligence on Greenland, according to two sources with knowledge of the matter, in a sign President Donald Trump apparently remains focused on acquiring the island.