LONDON, April 15 -- US President Donald Trump has threatened to renege on a trade agreement with the UK, limiting the impact of US tariffs, as he again criticised Britain's lack of support in the Iran war.

But Trump, who has repeatedly slammed the policies of British Prime Minister Keir Starmer, said strains in the relationship with the US's Nato ally would "not at all" negatively affect King Charles III's state visit to the US later this month.

"We gave them a good trade deal, better than I had to, which can always be changed," the US president was quoted as saying by Sky News today.

The comments came in a phone interview with Sky News US reporter Mark Stone.

London and Washington concluded a trade agreement last year capping US tari...