Senate asked to be briefed on Syria. They asked to be briefed on NK. That is what they do when someone is threatening action or acting and they know nothing. Just because the someone asked for something doesn't mean why Trump is having an unusual briefing doesn't matter and there isn't a why to the timing of it. Did he hold one like this for Syria after he bombed them and everyone in Congress asked to be briefed about WTF Trump was thinking big picture?