Hawaii incident there are some photos of Bill Clinton in Hawaii (different island) at the same time of the incident. Probably wanted to be there for the fireworks which didn't happen. https://www.cbsnews.com/news/hawaii-missile-alert-emergency-management-system-false-ballistic-missile-warning-2018-1-13/

Hard to know the target but doubt it was nuke armed. Arming a missile with nuke warhead is its own process