US President Donald Trump has been discussing "a range of options" to acquire Greenland, including use of the military, the White House said.

The White House told the BBC that acquiring Greenland - a semi-autonomous region of fellow Nato member Denmark – was a "national security priority".

The statement came hours after European leaders issued a joint statement rallying behind Denmark, which has been pushing back against Trump's ambitions for the Arctic island.

Trump repeated over the weekend that the US "needed" Greenland for security reasons, prompting Danish Prime Minister Mette Frederiksen to warn that any attack by the US would spell the end of Nato.

The White House said on Tuesday: "The president and his team are discussing a range of options to pursue this important foreign policy goal, and of course, utilizing the US military is always an option at the Commander-in-Chief's disposal."

Nato is a trans-Atlantic military group where allies are expected to go to each other's aid in case of external attacks.

On Tuesday, six European allies expressed support for Denmark.

"Greenland belongs to its people, and only Denmark and Greenland can decide on matters concerning their relations," the leaders of the UK, France, Germany, Italy, Poland, Spain, and Denmark said in a joint statement.

Stressing they were as keen as the US in Arctic security, the European signatories of the joint statement said this must be achieved by Nato allies, including the US "collectively".

They also called for "upholding the principles of the UN Charter, including sovereignty, territorial integrity and the inviolability of borders".

Greenland's Prime Minister Jens-Frederik Nielsen welcomed the statement and called for "respectful dialogue".

"The dialogue must take place with respect for the fact that Greenland's status is rooted in international law and the principle of territorial integrity," Nielsen said.

The issue of Greenland's future resurfaced in the wake of the US military intervention in Venezuela, during which elite troops seized the country's President Nicolás Maduro and took him to face drugs and weapons charges in New York.

A day after that raid, Katie Miller - the wife of one of Trump's senior aides - posted a map on social media of Greenland in the colours of the American flag, alongside the word "SOON".

On Monday, her husband, Stephen Miller, said it was "the formal position of the US government that Greenland should be part of the US".

Asked repeatedly in an interview with CNN whether America would rule out using force to annex it, Miller responded: "Nobody's going to fight the US over the future of Greenland."

Greenland, which has a population of 57,000 people, has had extensive self-government since 1979, though defence and foreign policy remain in Danish hands.

While most Greenlanders favour eventual independence from Denmark, opinion polls show overwhelming opposition to becoming part of the US, which already has a military base on the island.

Morgan Angaju, 27, an Inuit living in Ilulissat in the west region of the country, told the BBC it had been "terrifying to listen to the leader of the free world laughing at Denmark and Greenland and just talking about us like we're something to claim".

"We are already claimed by the Greenlandic people. Kalaallit Nunaat means the land of the Greenlandic people," Morgan said.

He added that he was worried about what happens next - wondering whether Greenland's prime minister may suffer the same fate as Maduro - or even about the US "invading our country".

An unnamed US senior official told Reuters news agency that the American options included the outright purchase of Greenland or forming a Compact of Free Association with the territory.

In response, a state department spokesperson told the BBC on Tuesday that the US "is eager to build lasting commercial relationships that benefit Americans and the people of Greenland".

"Our common adversaries have been increasingly active in the Arctic. That is a concern that the United States, the Kingdom of Denmark, and NATO Allies share," the spokesperson said.

US Secretary of State Marco Rubio also told lawmakers at a classified briefing on Capitol Hill on Monday that the Trump administration did not plan to invade Greenland, but mentioned buying it from Denmark, the Wall Street Journal reports.

Greenland and Denmark previously said they had asked to meet Rubio quickly to discuss the American claims on the island.

Denmark's Foreign Minister Lars Lokke Rasmussen said speaking with America's top diplomat should resolve "certain misunderstandings".

Senator Eric Schmitt, a Republican from Missouri, emphasised the national security aspect when he spoke to the BBC on Tuesday.

"I think they're just in talks right now," he said. "My hope is that Europe would understand that a strong America is good - it's good for Western civilisation."

Trump floated his idea of acquiring Greenland as a strategic US hub in the Arctic during his first presidential term, saying in 2019: "Essentially it's a large real estate deal."

There is growing interest from Russia and China in the island, which has untapped rare earth deposits, as melting ice raises the possibility of new trade routes.

In March, Trump said America would "go as far as we have to go" to get control of the territory.

During a congressional hearing last summer, Defence Secretary Pete Hegseth was asked if the Pentagon had plans to take Greenland by force if necessary, and he said they "have plans for any contingency". (BBC)

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