When I was a reporter in a war zone where all civilians carried guns — i.e. Afghanistan in the 1980s — reporters were strongly advised not to, because it was important to maintain the distinction between combatants and civilians, should anything happen, and rules need to be invoked. So the idea of Lindsey Graham carrying a gun in Iraq is more than merely ridiculous. It potentially endangers him.
I was going to suggest that we offer pistols, maybe with fashionably knotted Hermes scarves dangling from them, to certain congressional leaders who like to travel to hotspots and denounce U.S. policy there. But that would really be immature and inappropriate.