Trump who was addressing a crowd in Cedar Rapids, Iowa said: "We're thinking of something that's unique".
Trump told supporters at a rally in Iowa that he is looking into building not just a "big, beautiful" wall on the southern border, but decking it out with solar panels too.
Mexico's government has responded to Donald Trump after the USA president called it the second deadliest country in the world after Syria.
In a statement issued few hours after the tweet, the foreign ministry of Mexico said that while it has a significant problem of violence, it is not the second most violent nation in the world.
Trump is believed to be citing a report from the International Institute for Strategic Studies; he previously retweeted a link to a CNN story on the report published in May.
Raymond James analyst Pavel Molchanov warns investors that Trump's wall talk is not a good reason to chase the rally in solar shares: "Setting aside the broader question of whether the wall will even be politically realistic, the notion that it will be covered in solar hardware is entirely far-fetched".
GOP senators oppose new health care bill
But under the Senate Bill funding would start phasing out and by 2024 it would be restored to what it was before Obamacare . The Affordable Care Act is viewed as one of - if not the - signature achievement of his administration.
Department of Homeland Security spokesman David Lapan said nobody from the department had shared the submitted proposals with the White House, though several have been made public by the bidding companies. "Good? My idea." He added: "I think we could make it look lovely, too", he added. He said that the solar panels would provide cheap energy and help to cover up the cost of the controversial wall, BBC reported.
Donald Trump is thinking about the engineering, one of his new idea regarding the border wall between the United States and Mexico is so-called "solar wall".
However, the U.N. Office on Drugs and Crime, whose latest figures are from 2015, indicates there are at least nine countries with higher homicide rates than Mexico. "Right? Good? My idea!" "Good? My idea." Stated Trump for reasons best known to himself.
Trump on Thursday slammed Mexico in a tweet emphasizing on his pledge to "build the wall". Solar wall panels. Think of it, the higher it goes, the more valuable it is.
Mexico quickly countered, saying Trump's claim is wrong.
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