'We're closer than ever to war with North Korea'

Michael Mullen, the former Chairman of the Joint Chiefs of Staff, warned on Sunday that the United States faces a greater threat of nuclear conflict on the Korean peninsula than at any previous time.

"We're actually closer in my view, to a nuclear war with North Korea and in that region than we have ever been," Mullen, who served under Presidents George W. Bush and Barack Obama, told ABC News "This Week".