James Mattis Warns North Korea After Latest Nuclear Test

Defense Secretary James Mattis said the United States will prepare for all military options following North Korea's claim that the country had successfully detonated a hydrogen bomb during its sixth missile test.

"Any threat to the United States or its territories, including Guam or our allies will be met with a massive military response — a response both effective and overwhelming," Mattis said outside the White House Sunday, flanked by Joint Chiefs Chairman Gen. Joseph Dunford.