Via Twitter, Trump Threatens To Cancel Mexico Visit To White House Over Wall [Getty Images]

The Twitter Inc. accounts of U.S. President Donald Trump, @POTUS and @realDoanldTrump, are seen on an Apple Inc. iPhone arranged for a photograph in Washington, D.C., U.S., on Friday, Jan. 27, 2017. Mexican President Enrique Pena Nieto canceled a visit to the White House planned for next week after Trump on Thursday reinforced his demand, via Twitter, that Mexico pay for a barrier along the U.S. southern border to stem illegal immigration. Photographer: Andrew Harrer/Bloomberg via Getty Images

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