Greenland is not for sale and the idea of selling it to the United States is absurd, Denmark’s prime minister said Sunday, after an economic adviser to President Donald Trump confirmed the US interest in buying the world’s largest island, Reuters reported.

“Greenland is not for sale,” Danish Prime Minister Mette Frederiksen told the newspaper Sermitsiaq during a visit to Greenland. “I strongly hope that this is not meant seriously.”

Trump confirmed to reporters on Sunday that he had recently discussed the possibility of purchasing Greenland, though he said such a move was not an immediate priority.

“The concept came up and ...strategically it’s interesting,” Trump told reporters. “[But] it is not No.1 on the burner.”

Trump is due to visit Copenhagen early next month, when the Arctic will be on the agenda in meetings with Frederiksen and Prime Minister Kim Kielsen of Greenland, an autonomous Danish territory.

White House economic adviser Larry Kudlow on Sunday initially confirmed media reports earlier in the week that Donald Trump had privately discussed with his advisers the idea of buying Greenland.

Kudlow said the situation was “developing,” and noted that US President Harry Truman also had wanted to purchase Greenland.

“And they’ve got a lot of valuable minerals,” he added, in particular.