Donald Trump has doubled down on his threats to acquire Greenland, saying the US is "going to do something [there] whether they like it or not".

Speaking at a meeting with oil and gas executives at the White House, the US president justified his comments by saying: "If we don't do it, Russia or China will take over Greenland. And we're not going to have Russia or China as a neighbor."

He added: "So we're going to be doing something with Greenland, either the nice way or the more difficult way."