The Trump administrative ratcheted up its campaign against North Korea on Wednesday, summoning all 100 senators to the White House to hear top defense officials declare that defending the U.S. from a possible nuclear attack has become a top priority.

The unusual classified briefing came after the top U.S. military officer in the Pacific said the Pentagon needed to consider deploying new anti-ballistic missile systems and a defensive radar to Hawaii to protect that island state against a growing threat from North Korea.

“Kim Jong Un is clearly in a position to threaten Hawaii today, in my opinion,” Adm. Harry Harris, the chief of U.S. Pacific Command, told the House Armed Service Committee. “I have suggested that we consider putting interceptors in Hawaii that . . . defend (it) directly, and that we look at a defensive Hawaii radar.”

President Donald Trump has dispatched additional military resources to the region following North Korea’s engagement in a series of weapons tests in recent months, but aides say he hopes to use additional economic sanctions and diplomacy before resorting to military options.