In late December, US lawmakers and media reported that the US Treasury alerted them to new Iranian sanctions, which were later recalled, Sputnik reported.
"You have seen us respond through a sanctions regime to their [Iran's] ballistic missile activity in the past, and I fully expect that you will see us respond appropriately in the future," Kirby said.
The State Department would not respond to whether new sanctions would be implemented against Iran, but noted that "there are some technical issues we are still working through."