U.S. Homeland Security Secretary Kristi Noem visited the U.S.-Mexico border in Santa Teresa on Tuesday afternoon to announce new changes to the southern border wall. Speaking alongside U.S. Border Patrol agents,

Homeland Security Secretary Kristi Noem says the entire southern border wall with Mexico is being painted black to deter illegal immigration, at President Trump's request.

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.