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

The Denmark prime minister's comments come a day after the top American diplomat in the country was summoned for an explanation of reports of U.S. intelligence gathering in 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.