US President Donald Trump is considering making an offer to buy Greenland, the White House said Wednesday, despite the island's people and controlling power Denmark making clear the territory is not for sale.

Veteran diplomat tells CBS News Denmark "ready to cooperate" on Greenland, and he expects U.S. to abandon "anachronistic approach of colonialism" post-Trump.

The U.S. administration's willingness to entertain using military force to take Greenland has deeply rattled fellow NATO members.

Trump’s threat to annex an autonomous part of Denmark has plunged NATO into an unprecedented situation: An alliance based on collective defense now faces the prospect that one member might attack another.

President Trump's remarks about taking Greenland by military force have prompted bipartisan criticism from lawmakers who have said they do not support acquiring the Danish territory in such a way.

The senator's comments come after President Donald Trump said the U.S. would "do something on Greenland, whether they like it or not."

The rhetoric follows a dramatic U.S. raid in Venezuela and revives Trump’s long-standing focus on Greenland, transforming diplomatic discussions into fears of coercion. But U.S. military posture there remains unchanged.