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

He has said the U.S. will take control of Greenland eventually and has not ruled out military intervention, alarming American allies, particularly Denmark. The U.S. has a military

Officials summoned the American ambassador to express its displeasure after the Trump Administration was said be ratcheting up surveillance.