The Trump administration is testing part of the US-Mexico border wall with black coating, a move that comes after President Donald Trump expressed his desire to paint his signature wall black but ...

Pointed tops. Fewer gates. Resistance to climbing. The president’s frequently changing design requests have frustrated Homeland Security officials and military engineers.

Despite abandoning other ideas for his border wall like a moat, President Trump still wants to paint it black, which could cost between $500 million and $3 billion, according to the Washington Post.