Britain's BBC is "determined to fight" any legal action filed by U.S President Donald Trump, saying on Monday there was no basis for a defamation case over its editing of one of his speeches.

Mr Trump said last week he would likely sue the BBC for as much as $US5 billion ($7.6 billion) after the broadcaster spliced together separate excepts of one of his speeches, creating the impression he was inciting the January 6, 2021 riot.

The British national broadcaster's chair Samir Shah then sent a personal letter to Mr Trump to apologise for the edit, the BBC said, but the broadcaster said it strongly disagreed there was a basis for a defamation claim.

But that has done little to quell Mr Trump's displeasure, with the US president telling reporters on Friday he would sue for anywhere between

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