Greenland: Trump warned that island cannot be bought from Denmark

Greenland has said it is "not for sale" following reports that US President Donald Trump has spoken about buying the world's biggest island.

The president is said to have discussed the idea of purchasing Greenland, an autonomous Danish territory, during dinners and meetings with advisers.

But Greenland's foreign ministry dismissed the idea, saying: "We're open for business, not for sale."

Trump's reported plans have also been quickly dismissed by politicians in Denmark. "It must be an April Fool's Day joke...but totally out of [season]!", tweeted former Prime Minister Lars Lokke Rasmussen.

The Wall Street Journal (WSJ), which first reported the news, said Mr Trump had spoken about the purchase with "varying degrees of seriousness".

Sources quoted in other media differed over whether the president was joking or seriously hoping to expand US territory.

The White House has not commented on the reports.