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President Donald J. Trump debates with House Minority Leader Nancy Pelosi, D-Calif., and Senate Minority Leader Chuck Schumer, D-N.Y., about his border wall as Vice President Mike Pence listens during a meeting in the Oval Office of White House on Tuesday, Dec. 11, 2018 in Washington, DC. (Photo by Jabin Botsford/The Washington Post via Getty Images)

A prominent part of President Donald Trump's 2016 presidential campaign was his promise to build a tall, impenetrable wall between the United States and Mexico that he would make Mexico pay for. And it would definitely not be a fence.

Since being elected, the issue of who would pay for the wall and how it would be made be made evolved. The line between wall and fence was also blurred.

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