Gage Skidmore (https://creativecommons.org/licenses/by-sa/2.0/) Via Flickr
The US government designated the Quds Force as a terror organization in 2007. The Quds force is a wing of the special forces of the Iranian military and the Trump administration also named the Islamic Revolutionary Guard Corps a terror organization. They cited that the reason this wing of the Iranian military was designated as a terror organization was because of its attempted assassination fo the Saudi ambassador to the United States in 2011.