 As a director of the United States Secret Service, I take full responsibility for any security lapse of our agency. The Republican chair of the House Oversight and Accountability Committee holding the hearing, James Comer, says Cheadle should resign. The U.S. ambassador to the United Nations is on a mission to Haiti. She's trying to rally more support for a security force from Kenya intended to help Haiti's police reestablish order. NPR's Michelle Kellerman has more.