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

Danish Prime Minister Mette Frederiksen has issued a stern warning to the Trump administration following reports that U.S. intelligence agencies have been ordered to increase surveillance efforts targeting Greenland.

Danish Prime Minister Mette Frederiksen told The Associated Press “you cannot spy against an ally” after reports that the United States has stepped up intelligence gathering on Greenland, a semi-autonomous Danish territory coveted by U.