Donald Trump has insisted the NHS would be “on the table” in any post-Brexit trade talks. “When you’re dealing with trade everything is on the table. So NHS or anything else, a lot more than that,” the US president said at a press conference with Theresa May.

He earlier promised, not for the first time, a “very substantial” post-Brexit trade deal with the UK as he met Ms May on the second day of his state visit, following a lavish royal banquet at Buckingham Palace. The leaders also discussed the role of Huawei in the UK’s 5G network.

Meanwhile, Brexit Party leader Nigel Farage has said he had a “good meeting” with the president at the US ambassador’s residence and that Mr Trump “really believes in Brexit”.

Mr Farage was photographed being driven into Winfield House on Tuesday afternoon.

He later tweeted: “Good meeting with President Trump - he really believes in Brexit and is loving his trip to London.”

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Mr Farage has campaigned for years to take Britain out of the European Union and is one of Trump’s most prominent British supporters. The president has called him a friend.

Mr Farage’s newly founded Brexit Party was the big winner in last month’s European Parliament elections in Britain, scooping up support from voters angry that the UK has not left the EU.

He has criticised the prime minister's divorce deal with the bloc and said Britain should leave the EU without an agreement.

Mr Trump praised Ms May’s handling of Brexit on Tuesday, saying she had gotten a good deal.