King Charles is being strongly urged to issue a subtle ‘hands off Canada’ warning to Donald Trump when he makes an historic speech later this month.

The US President has caused widespread consternation by repeatedly calling for Canada to become America’s 51st state.

In what is being seen as a deliberately symbolic act, Charles will open a new session of parliament in Ottawa on May 27 and deliver the traditional ‘speech from the throne’ – the first time a monarch has done so in nearly 50 years.

While the royal visit signals strong support in itself, many believe that as Canada’s head of state, Charles should go further and remind Mr Trump that the country is off limits.

The speech, which introduces the Canadian government’s agenda, will be written for Charles who is bound by the Royal Family’s political neutrality.