The American president earlier appointed the Louisiana governor as a special envoy to the island, who said he will work to make it "part of the US"

The US needs Greenland for its "national security," President Donald Trump has said, after naming a special envoy to the Arctic island, which is under Danish sovereignty.

Since returning to the White House in January, Trump has revived his long-standing interest in acquiring Greenland from Denmark, pointing to its strategic location and mineral resources. He has not ruled out annexing the island.

"We need Greenland for national security," Trump told reporters on Monday. "You look up and down the coast, you have Russian and Chinese ships all over the place. We need it for national security. We have to have it," he added.

Trump's remarks followed his appointment of Louisiana Governor Jeff Landry as the US special envoy to Greenland, saying he chose Landry because "he's a deal-maker-type guy."

Announcing the appointment, Trump praised Landry for understanding "how essential Greenland is to our national security."

Landry later wrote on X that it was "an honor to serve" in the volunteer role "to make Greenland a part of the US," saying it would not affect his duties as governor.

Denmark, which has pushed back against Trump's drive to take the island, summoned the US ambassador after Landry's appointment.

"Out of nowhere, there is now a special US presidential representative, who, according to himself, is tasked with taking over Greenland," Danish Foreign Minister Lars Lokke Rasmussen told the TV 2 channel, calling the development "completely unacceptable."

Greenland, a self-governing Danish territory of about 57,000 people, has managed most domestic affairs since 1979, while defense and foreign policy remain under Copenhagen's control.

The US has maintained a military presence on the island since World War II. Vice President J.D. Vance visited a US Space Force base on Greenland's northwest coast in March, saying Washington was unlikely to use force to take the territory but remained open to Greenlanders exercising self-determination and breaking away from Denmark.