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.

The entire US-Mexico border wall will be painted black to make it hotter and harder to climb, Homeland Security Secretary Kristi Noem has said, crediting the idea to Donald Trump.

The black paint will also prevent rust on the steel, said US Border Patrol Chief Michael Banks.