He clearly stated that such an order would not be a legal order. What exactly do you think the factual term ‘preposterous’ means? Under American law, it is illegal to attack a country that America has a peace pact with, and both counties are members of NATO. No ‘executive order’ can change that, and every officer in the American military knows that they can be charged and if convicted imprisoned for following an order that is not a legal order, no matter who gives it.