Might be a good time to remind people that Mattis had to remind Trump when he tried to withdraw all our troops from South Korea that it would have signaled to NK that we were about to bomb them and they might try to nuke us in desperation in response.
Also that Mattis was one of the two people to stop Trump from being able to launch a nuke. And that him and McMaster literally discussed with each other what they would do if Trump tried to order one, like having to tackle him or something. So we could at least rely on him to do that if necessary.
What's the next guy gonna do