In the U.S. presidential race, Libertarian candidate Gary Johnson stumbled on national television when asked about the war in Syria. The gaffe came as Johnson appeared on MSNBC’s “Morning Joe” on Thursday. Johnson was questioned by host Mike Barnicle.

Mike Barnicle: “What would you do, if you were elected, about Aleppo?”

Gary Johnson: “About?”

Barnicle: “Aleppo.”

Johnson: “And what is Aleppo?”

Barnicle: “You’re kidding.”

Johnson: “No.”

Barnicle: “Aleppo is in Syria. It’s the—it’s the epicenter of the refugee crisis.”

Johnson: “OK, got it. Got it.”

Barnicle: “OK.”

Johnson: “Well, with regard to Syria, I do think that it’s a mess. I think that the only way that we deal with Syria is to join hands with Russia to diplomatically bring that at an end.”

Johnson isn’t the only public figure to show confusion over Aleppo. Christopher Hill, a former United States ambassador to Iraq, called Aleppo “the capital of ISIS.” There is no significant presence of ISIS in the city.