Trump named Louisiana Governor Jeff Landry on Sunday as his special envoy to Greenland, drawing renewed criticism from Denmark and Greenland over Washington's interest in the mineral-rich Arctic island.
Trump has advocated for Greenland, a self-governing Danish territory, to become part of the US, citing its strategic importance and mineral resources.
"We need Greenland for national security, not for minerals ... If you take a look at Greenland, you look up and down the coast, you have Russian and Chinese ships all over the place," Trump told reporters in Palm Beach, Florida on Monday.
"We need it for national security. We have to have it."
The move prompted a stinging rebuke from Denmark Prime Minister Mette Frederiksen and Greenland's Prime Minister Jens-Frederik Nielsen.
"You cannot annex another country. Not even with an argument about international security," they said in a joint statement.
"Greenland belongs to the Greenlanders and the US shall not take over Greenland."
In a post on Truth Social, Trump wrote: "Jeff understands how essential Greenland is to our National Security, and will strongly advance our Country's Interests for the Safety, Security, and Survival of our Allies, and indeed, the World."
Landry, in a post on X, thanked Trump: "It's an honour to serve ... in this volunteer position to make Greenland a part of the US This in no way affects my position as Governor of Louisiana!"
The Trump administration put further pressure on Copenhagen on Monday, when it suspended leases for five large offshore wind projects being built off the East Coast of the US, including two being developed by Denmark's state-controlled Orsted.
Greenland, a former Danish colony with a population of about 57,000, has the right to declare independence under a 2009 agreement but remains heavily reliant on fishing and Danish subsidies.
Its strategic position between Europe and North America makes it a key site for the US ballistic missile defence system, while its mineral wealth has heightened US interest in reducing reliance on Chinese exports.
Greenland's Nielsen commented on Facebook: "We have woken up again to a new announcement from the US president. This may sound big, but it does not change anything for us. We decide our own future."
Danish Foreign Minister Lars Lokke Rasmussen said he would summon US Ambassador Kenneth Howery, who had pledged "mutual respect" during a recent visit to Greenland.
"Out of nowhere, there is now a special US presidential representative, who, according to himself, is tasked with taking over Greenland. This is, of course, completely unacceptable," Rasmussen told TV2.
Denmark has sought to repair strained ties with Greenland over the past year, while also trying to ease tensions with the Trump administration by investing in Arctic defence to address US criticisms about inadequate security.
"It is a difficult situation that our allies for a lifetime are putting us in," Prime Minister Frederiksen said in an Instagram post.
