Oh please - Sullivan is a Trump loyalist and will support whatever Trump says. If Trump gives the order to nuke, Sullivan will give his thumbs up and hide in the congressional DC bunker while Alaska burns. 

Let's not forget that a nuclear strike against North Korea will mean that China will have no choice but to get involved. And if China gets involved then Russia will also. 

China and Russia will NOT support Trump.

Scared? Good. You need to be. These are dangerous times and there is a very high likelihood that we won't see Christmas. 

Nobody wins in a game of chicken when it comes to nuclear weapons. Someone will call the other person's bluff.