On Wednesday, senators were briefed at the White House by top national security advisers on the situation in North Korea, but several said they left the meeting without hearing any solid details on how the U.S. will deal with the country as it remains intent on building a nuclear arsenal. Senate Majority Leader Mitch McConnell (R-Ky.) asked for the briefing, which was delivered by Secretary of State Rex Tillerson, Defense Secretary James Mattis, National Intelligence Director Daniel Coats, and Gen.