Keir Starmer is under pressure to call off the King’s planned state visit to the United States due to Donald Trump’s controversial remarks about Greenland.

The U.S. president has alarmed NATO allies with his recent threats, suggesting that countries opposing the U.S. acquisition of the Danish territory will face heavy tariffs starting February 1.

In an explosive message on his social media platform, Trump announced that these tariffs will begin at 10% and could escalate to 25% if the countries do not comply by June.

His statement specifically targeted the UK, France, Germany, and Denmark.

This move has sparked outrage among Western leaders, raising concerns that Trump might be aiming to dismantle the military alliance that has been pivotal in maintaining global peace for the last 80 years.

British MPs have joined the chorus of criticism, with some suggesting that King Charles should cancel his anticipated spring trip to Washington. Senior Conservative Simon Hoare remarked, “The civilized world can no longer tolerate Trump. He behaves like a gangster pirate.”

Donald Trump has shocked NATO allies by warning that opponents of an American takeover of the Danish territory will be hit with punitive tariffs from February 1

Sir Keir delivered some of his strongest criticism of Mr Trump last night, having expended huge effort trying to maintain warm ties with the president

MPs also joined the backlash, with calls for the mooted trip by King Charles to Washington in the Spring to be cancelled

Sir Keir said the UK Government would be ‘pursuing’ America over the threat of tariffs and called Mr Trump’s plan ‘completely wrong’

Senior Tory Simon Hoare said Mr Trump was behaving like a ‘gangster pirate’ 

Economists have raised concerns that the UK will be back on ‘recession watch’ if the US goes ahead with tariffs. 

Senior MEP have warned that the EU-US trade deal will be frozen in reprisals, with the spectre of a full-blown global trade war again looming. 

Sir Keir delivered some of his strongest criticism of Mr Trump last night, having expended huge effort trying to maintain warm ties with the president.

The PM said: ‘Our position on Greenland is very clear – it is part of the Kingdom of Denmark and its future is a matter for the Greenlanders and the Danes.

‘We have also made clear that Arctic security matters for the whole of Nato, and allies should all do more together to address the threat from Russia across different parts of the Arctic.

‘Applying tariffs on allies for pursuing the collective security of Nato allies is completely wrong. We will, of course, be pursuing this directly with the US administration.’

Emmanuel Macron also reacted furiously to the news, promising consultation with EU leaders. The French president said: ‘No intimidation nor threat will influence us, neither in Ukraine, nor in Greenland, nor anywhere else in the world when we are confronted with such situations.

‘Tariff threats are unacceptable and have no place in this context. Europeans will respond to them in a united and co-ordinated manner if they were to be confirmed. We know how to uphold European sovereignty.’

John Bolton, Mr Trump’s former national security adviser, said: ‘Donald Trump’s extraordinary tariff threat against the UK and other countries for things they have said or done regarding Greenland is without doubt his most dangerous and destructive assertion during the five years of his presidency.

‘To say it is without precedent radically understates how foolish and contrary to fundamental American interests it is. Its ramifications for the special relationship and Nato alliance – indeed for the credibility and trust the United States has spent decades trying to establish – is incalculable.’

The UK already pays a 10 per cent tariff on some goods imported by the US, after Mr Trump introduced a wave of taxes on countries around the world on his ‘Liberation Day’ last April.

Mr Trump’s announcement is the latest twist in the White House’s new foreign policy strategy – dubbed the ‘Donroe Doctrine’ after the earlier Monroe Doctrine – in which it seeks to dominate the western hemisphere and prevent foreign control of vital assets.

The UK has deployed just one military officer, at Denmark’s request, to Greenland to join a reconnaissance group ahead of an exercise named Arctic Endurance.

Yesterday, hundreds of people in Greenland’s capital braved near-freezing temperatures to march in a rally in support of their own self-governance

The Labour chair of the Commons Foreign Affairs committee, Emily Thornberry, insisted the UK ‘will not be intimidated’  

Mr Trump has insisted the US needs to acquire Greenland for national security reasons and has not ruled out using military force. He has claimed it is vital for his planned missile defence shield known as the Golden Dome.

However, critics claim his interest is linked to Greenland’s untapped mineral wealth rather than defence. The island possesses at least 25 of the 34 raw materials considered ‘critical’ by the EU.

A meeting at the White House last Wednesday, led by Vice President JD Vance with representatives from Denmark and Greenland, ended in an impasse.

Yesterday, thousands of protesters took to the streets in Denmark and in Greenland’s capital Nuuk, chanting ‘Greenland is not for sale’ amid anger over the threats. 

Mr Trump is known to be a huge admirer of the Royal Family. Sir Keir wooed him with an unprecedented second state visit to the UK last year, when he was feted with great pomp and ceremony.

The King has been expected to visit the US in April, while a trip by the Prince of Wales has also been pencilled in.