I didn't see any demanding going on there. He asked for a couple of Marines to cover himself and the Prime Minister. And it took them about ten seconds to get to the podium; so, apparently they were right there standing by. Is that a problem? Really? You have an issue with that? Get a ******* life, pal.
You know that when the President "requests" something of the Military, it is considered an order, right?
Just as my son knows that if I "ask"' him to clean his room, mow the lawn, be home at a certain time that I expect it to happen. Just because I "asked" that doesn't give him the option of saying no or not doing it.