President Joe Biden said on Sunday that the United States will "respond" to actions Iran has taken against Washington's interests, including drone strikes.
On Friday, the US issued a fresh round of Iran-related sanctions tied to a Revolutionary Guard Corps drone program that it said threatened regional stability.
American officials have blamed Iran for a drone attack on a remote US outpost in Syria. Officials said last week the US believes Iran resourced and encouraged the attack, but that the drones were not launched from Iran.
