US President Donald Trump said that newly appointed British Prime Minister Andy Burnham has a big task ahead, but he will be able to do it, and pledged that the United States will provide assistance.

The British news agency PA Media reported that Trump said in a message on Truth Social that he wished Burnham 'good luck and success'.

Trump's congratulations come after he spoke with Burnham by phone within an hour of his arrival at the British government headquarters.

Trump said, 'I had a good conversation with the new UK Prime Minister, Andy Burnham.'

He added, 'We discussed several issues, including the existing relationship with the United Kingdom.'

He explained, 'We will meet in the near future to discuss matters of mutual interest.'

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What happened?

Burnham became, on Monday, the seventh British Prime Minister in a decade, pledging to reshape British politics to offer a new economic model and revive a nation 'tired' of the frequent turnover of leaders.

Trump criticized former British Prime Minister Keir Starmer over the US-Israeli war on Iran, as well as issues of immigration, energy, and regulation of the technology sector.

Burnham's office said he assured Trump that London would commit to defense and security and support the safe reopening of the Strait of Hormuz, after it remained effectively closed since the start of the war, causing energy prices to rise.

Relations between Trump and Starmer became strained when Britain initially rejected a US request to use British bases for strikes on Iran, and Starmer later authorized the United States to use the bases.

Trump said late last month that he knew little about Burnham, describing him as 'very liberal' and someone who likely would not open the North Sea for more oil drilling.