Maggie Haberman, New York Times White House correspondent, and Julia Ioffe, The Atlantic national security and foreign policy staff writer, on Donald Trump's refusal to say anything definitive about Russia's involvement in the U.S. elections, a tactic which is beginning to frustrate the president's supporters. Haberman explains that President Trump is a real estate guy and he treats everything as if it is an open ended negotiation. "And that's very very dangerous when you're dealing with matters of national security," she says.