Earlier today, the Libertarian presidential nominee Gary Johnson was asked by journalist Mike Barnicle “What would you do, if you were elected, about Aleppo?” Johnson replied with his own question: "What is Aleppo?" Aleppo is Syria's largest city, an urban battlefield in the brutal Syrian Civil War since 2012. Reporters and photojournalists have been covering the conflict for years, documenting the belligerents as well as the tragic circumstances of those civilians caught up in the multifaceted war. When Barnicle asked “What would you do about Aleppo?” he was asking what would the candidate do to stop the horrors made visible to us by the photojournalists below. See also, our own Uri Friedman’s answer to “What is Aleppo?” (Thanks to Corinne Perkins for the title and idea.) Editor’s note: Many of the following images are graphic in nature.