I was wrong. Apparently, the SecDef (or successor) has to confirm the order can't from the President.
Regardless, it is no business of the Speaker or anyone else in Congress. Their entire premise is flawed in thinking such a thing should be done by committee if, heaven forbid, we were under overt attack.
Plus, the rationale in the letter talked about when Trump threatened to remove North Korea from the map. Completely omitting the fact Un threatened an attack on us first and Trump explained what would happen if they did.
Face facts here. If it was a GOP controlled House, they wouldn't be presenting this.