In late June, Seymour Hersh published an article in Die Welt claiming that the Assad government did not attack the town of Khan Sheikhoun with sarin on April 4. His argument aligns with a popular left narrative about American imperialism falsifying or exaggerating events in Syria to justify intervention and regime change.

For example, many commentators — Jonathan Cook, Uri Avnery, among others — have wondered why Bashar al-Assad would use chemical weapons when he was already winning the war. The attack seemed not only unnecessary but also likely to spark a harsh international response.

Soon after the Khan Sheikhoun bombing, the White House responded to these concerns. The short version appeared in a document released on April 11: