Denmark 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.

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

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. The directive was first reported by The W all Street Journal .