Greenland's government has said the island is "not for sale" after Donald Trump reportedly talked to aides about buying the territory from Denmark.
An ally of the US president said on Thursday the president had discussed the purchase on multiple occasions.
The US leader raised the issue during meetings and dinners, discussing the advantages of owning the world’s largest island, an autonomous Danish territory, according to reports.
According to the aide, Mr Trump’s proposal for the US to snap up Greenland has each time come with “varying degrees of seriousness”.
However, a Greenland government spokesman said on Friday: "We have a good cooperation with USA, and we see it as an expression of greater interest in investing in our country and the possibilities we offer.
"Of course, Greenland is not for sale."
Mr Trump is set to visit Denmark next month, but the prospect of such a purchase is not expected to be on the agenda.
Greenland is home to Thule Air Base, the US military's northernmost base, which is located about 750 miles above the Arctic Circle built in 1951.
The radar and listening post features a ballistic missile alert system that can warn of incoming intercontinental projectiles and reaches thousands of miles into Russian territory.
In 1946, the US proposed to pay Denmark $100 million to buy Greenland after flirting with the idea of swapping land in Alaska for strategic parts of the Arctic island.
Neither the White House nor Denmark have yet commented on the proposals, which were first reported in the Wall Street Journal on Thursday.
