That is specifically at the request of the president, who understands that in the hot temperatures down here, when something is painted black, it gets even warmer,' Noem said.

Noem announced Tuesday that the U.S.-Mexico border wall is being painted black in an attempt to make it more difficult for migrants to climb.

U.S. President Donald Trump's administration is once again touting black paint on border walls to deter illegal migration — a questionable and expensive proposition.