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 Prime Minister Mette Frederiksen said "you cannot spy against an ally" after reports that the U.S. was gathering intelligence on Greenland.

Denmark’s Prime Minister Mette Frederiksen weighed in on the report that the United States has stepped up its spying efforts on Greenland, telling The Associated Press that “you cannot spy against