Mr Trump has received a flurry of visitors since becoming the presumptive Republican nominee last month, including Lord Cameron and Dame Karen Pierce, the British ambassador to the US.

On Thursday night, Dame Karen hosted a drinks reception at the British embassy in Washington, which was attended by Chris LaCivita, a senior adviser to Mr Trump’s campaign.

Lord Cameron has declined to comment on his discussions with the former president at Mar-a-Lago, but described him on Wednesday as “certainly an interesting guy”. In his 2019 memoir, the former prime minister said Mr Trump was “xenophobic” and “misogynistic”.

At the dinner, Lord Cameron tried to convince Mr Trump over a steak dinner that he should support Ukraine’s war effort, by arguing that Vladimir Putin would continue invading European countries if he is not stopped by the West, the Washington Post reported.

A readout of the meeting from Mr Trump’s campaign referred only to the need to “stop the killing” during the war, in an apparent reference to his preferred policy of a negotiated ceasefire.

It was also reported on Friday that British diplomats had dined privately with the former president, attended his Super Tuesday victory party, and held meetings with Liz Truss and Nigel Farage – both of whom have a better relationship with Mr Trump than the British Government.

Five sources told The Washington Post that a British diplomat was regularly meeting with Mr Trump and senior Republicans.