Donald Trump named Louisiana Governor Jeff Landry on Sunday as his special envoy to Greenland, reigniting Danish and Greenlandic alarm over Washington’s plans for the vast, mineral-rich Arctic island.

Trump has said several times over the years that Greenland, a Danish territory that is now largely self-governing, should become part of the U.S., citing security reasons and an interest in the island’s mineral resources. Landry has praised the idea.

Danish Foreign Minister Lars Lokke Rasmussen said on Monday he would summon the U.S. ambassador to Copenhagen, saying he had been particularly upset by Landry’s support for Trump’s aim of making Greenland part of the United States. Greenland’s prime minister reiterated that the island would decide its own future.