US President Donald Trump told supporters that his proposed wall on the Mexican border could hold solar panels.

         At a rally in Iowa, he said the teams would provide cheap energy and help pay for controversial walls.

         He suggested that the plan was his own and said: "Imagination is good, right? Okay? My thoughts."

         However, solar panels have been included in the wall design submitted by the company.

         During the campaign, Trump pledged to build a wall on the Mexican border to stop illegal immigration and drug trafficking.

         He insisted that he would pay for Mexico, but President Enrique Pe?a Nieto had rejected the idea.