The Arctic island is not for sale, its own government and that of Denmark continue to emphasize.

Since his first term, President-elect Donald Trump has insisted that the United States should purchase Greenland — to the bewilderment of aides asked to investigate such a possibility, and despite repeated denials by top officials in Greenland and Denmark, of which the island is an autonomous territory, that it would ever be for sale at any price.

As he prepares to assume office, Trump has returned to the idea. “For purposes of National Security and Freedom throughout the World, the United States of America feels that the ownership and control of Greenland is an absolute necessity,” the president-elect wrote on Truth Social, his social media platform, over the weekend, in a statement announcing his choice for ambassador to Denmark. Kenneth Howery, the newly announced pick, is a co-founder of PayPal.

The Arctic island, which is roughly three times the size of Texas, has a population of about 57,000 people. It is on the North American continent, to Canada’s northeast, but is in practice part of Europe and is an autonomous territory of Denmark, which ruled over the island for more than 200 years and still maintains some control over its foreign policy.

Greenland’s prime minister, Múte Egede, echoed previous statements from Greenland’s leaders on the occasion of similar overtures from Trump during his first term. “We are not for sale and will never be for sale,” Egede said.

Here’s what we know about Trump’s call for the United States to own Greenland.