Denmark summoned the US ambassador in Copenhagen to discuss alleged espionage against Greenland amid a growing push to gain control of the Arctic island.

Danish Foreign Minister Lars Lokke Rasmussen said on Wednesday he would call in the acting U.S. ambassador to Denmark for talks after the Wall Street Journal reported Washington had ordered U.S. intelligence agencies to step up spying on Greenland.

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