Guest host Mark Thompson, “The War Room” host Michael Shure, Sierra Club Washington representative Lena Moffitt and BuzzFeed contributor Michael Hastings break down the Koch brothers’ involvement in petroleum coke being openly stored on the banks of Detroit River. Petroleum coke is a by-product of the oil refining process and can be harmful to the environment when burned. “This is the dirtiest by-product from the dirtiest source of oil on the planet,” Moffit says, adding that the 42817 ZIP code in Detroit “is one of the most polluted ZIP codes in the country. … This is the unfortunate lab where we can see what it means to bring tar sands to our country.”