The United States is expected to designate Iran's Revolutionary Guards Corps (IRGC) a foreign terrorist organization, three US officials said, marking the first time that Washington will formally label another country's military a terrorist group.
The decision is expected to be announced by the US State Department, perhaps as early as Monday, the officials said. It has been rumored for years.
US Secretary of State Mike Pompeo, a strident Iran hawk, has advocated for the change in US policy as part of the Trump administration's hardening posture toward Tehran.
It would come ahead of the first anniversary of President Donald Trump's decision to pull out of an international nuclear deal with Tehran and reimpose sanctions that had crippled Iran's economy.
The administration's decision to make the designation was first reported by the Wall Street Journal.