Libertarian presidential candidate Gary Johnson said he thought Aleppo was an acronym when he was asked about the city at the center of the Syrian civil war on Thursday.

“Well, I was thinking acronym when he said Aleppo. Guilty. No excuse whatsoever,” explained Johnson during a Thursday afternoon interview on Fox News. The Libertarian candidate responded “What is Aleppo?” when asked how he would respond to the city’s growing crisis while on MSNBC in the morning.