"Diplomacy on hyperdrive" to salvage U.S.-North Korea summit

Kim Yong Chol, a top aide to North Korean dictator Kim Jong Un, is in New York City for high-stakes meetings with Secretary of State Mike Pompeo. Their negotiations could determine if the two countries go ahead with a historic nuclear summit. "Face the Nation" moderator Margaret Brennan joins "CBS This Morning" to discuss the efforts at diplomacy.