Stephen Colbert Does The Real Math On Donald Trump’s Promised Border Wall

NEW YORK - SEPTEMBER 22: Donald Trump talks about his US Presidential campaign on The Late Show with Stephen Colbert, Tuesday Sept. 22, 2015 on the CBS Television Network. (Photo by John Paul Filo/CBS via Getty Images)

President Donald Trump has promised so many things of his controversial southern border wall.

On the 2016 presidential election campaign trail, Trump vowed that his proposed U.S.-Mexico barrier would be “big, “powerful,” “impenetrable,” “physical” and “beautiful.”

With the due date for contractors to submit prototypes falling Friday, “Late Show” host Stephen Colbert talked to construction experts to find out just what it would take to build the barrier ― if all Trump’s promises were to be met.

Find out how much Colbert estimates the wall would cost and how long it would take to build in the segment above.

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