America’s anger at Britain’s Huawei decision is real and the backlash has only just begun, Nigel Farage has warned after talking to Donald Trump and his top team this week.

Speaking to The Telegraph after his Washington visit, Mr Farage said there is “genuine” and “growing” concern in Republican circles over letting the Chinese company build the UK 5G network.

Mr Farage said figures on Capitol Hill repeatedly raised the possibility of knock-on implications for UK-US intelligence sharing, suggesting the row Boris Johnson has tried to minimise is not going away.

The Brexit Party leader predicted more confrontation to come: “We believe in UK sovereignty. It is our choice to make. But it is, I have to say, one I'm very, very worried about, as I have been all the way through.”

The blunt message emerged as Mr Farage, one of the most connected British politicians in 'Trumpland', spent much of this week in the American capital for on the most defining weeks in the 45 US president’s tenure.

Mr Farage was in the room for Mr Trump’s State of the Union address on Tuesday, in the city for the impeachment acquittal on Wednesday and saw the president just hours after his combative press conference on Thursday.

The pair met for around half an hour in the Oval Office, according to Mr Farage, posing for pictures by the famous Resolute desk. Mr Farage also saw Mike Pence, the US vice president, and Larry Kudlow, Mr Trump’s top economics adviser.

“Of course he's upbeat,” Mr Farage said of the president’s mood. Some Republican senators who cleared Mr Trump this week had also dubbed his conduct in the Ukraine scandal “wrong”, but there have been no public signs of contrition.

“He's just had a fantastic week, an amazing week” Mr Farage said. “We've had the farce in Iowa, [Nancy] Pelosi demeaning the office of speaker, impeachment ending, an astonishing State of the Union speech … I can assure you that for him, the family, this is a good week.” Critics, of course, vehemently disagree.