Rep. Michael McCaul, a Republican from Texas and chairman of the House Homeland Security Council, discusses his advisory work with President Donald Trump on the building of a wall along the U.S.-Mexican border and funding options to start the wall's construction. McCaul also touches upon gun violence in Chicago, cyber security, and suspicion of Russian involvement in the U.S. presidential election. He speaks with Bloomberg's David Gura on "Bloomberg Markets." (Source: Bloomberg)