In response, Buckingham Palace tells the BBC the King is "naturally mindful" of the UK government's "well-known position" on preventing nuclear proliferation.

In his remarks at the White House this morning to welcome King Charles and Queen Camilla, Trump spoke about his Scottish roots.

"Charles agrees with me, even more than I do," said President Trump at the White House state dinner.

President Donald Trump is set to attend White House Correspondents’ Association dinner for the first time as commander-in-chief, surrounded by the journalists he routinely berates and threatens