Meet the State Dept. Science Envoy Who Spelled Out "Impeach" in His Resignation Letter to Trump

The science envoy for the U.S. State Department Dan Kammen has resigned in protest of President Trump’s refusal to quickly condemn the deadly white supremacist violence in Charlottesville, Virginia, earlier this month. In his resignation letter, Kammen, referring to Trump, wrote, "Your presence in the White House harms the United States domestically and abroad and threatens life on this planet." The first letter of each paragraph of his resignation letter spells out the word: "Impeach." We speak with Dan Kammen, professor of energy at University of California, Berkeley.