President Trump has reportedly talked to his aides and allies about whether the US could buy Greenland – but the country’s foreign minister said Friday that the world’s biggest island is not on the market.

“We are open for business, but we’re NOT for sale,” Ane Lone Bagger told Reuters.

People familiar with the deliberations said Trump asked his White House counsel to look into the matter, according to The Wall Street Journal, which first reported about his interest.

President Trump made his name on the world’s most famous island. Now he wants to buy the world’s biggest.

The idea of the U.S. purchasing Greenland has captured the former real-estate developer’s imagination, according to people familiar with the discussion, who said Mr. Trump has, with varying degrees of seriousness, repeatedly expressed interest in buying the ice-covered autonomous Danish territory between the North Atlantic and Arctic oceans.

President Trump’s idea to possibly buy Greenland for its natural resources left residents of the semiautonomous Danish territory amused, apoplectic and in disbelief, and received a chilly reception in Denmark on Friday.

“I hope it’s a joke, because it’s a terrible and grotesque thought,” said Martin Lidegaard, chairman of Denmark’s Foreign Policy Committee.

“It must be an April Fool’s Day joke … but totally out of season,” Lars Lokke Rasmussen, a former prime minister of Denmark and the leader of the opposition, posted on Twitter.