US President Donald Trump said Sunday evening that his country will not pay the cost of providing security protection for British Prince Harry and his wife Megan, who settled in Los Angeles, according to media reports.

"Now they leave Canada for the United States, but, the United States will not pay the cost of providing them with security protection. They must pay!" Trump wrote in his personal account on the social networking site "Twitter".

The couple Harry and Meghan had said in January that they would give up their royal duties.