UK King Charles gave US President Donald Trump a taste of his own medicine at a White House state dinner on Tuesday when he joked that without the British, Americans would be speaking French.

As the heads of state traded jokes during their dinner toasts, Charles referenced previous comments by Trump aimed at European allies he accuses of freeloading on defence since World War II.

“You recently commented, Mr President, that if it were not for the United States, European countries would be...