The Guard's formal designation as a "foreign terrorist organisation" kicked in Monday with a notice published in the Federal Register.
The unprecedented designation for a foreign government agency adds a layer of sanctions to the elite military unit and makes it a crime for anyone in US jurisdictions to provide it with "material support".
President Donald Trump and Secretary of State Mike Pompeo had announced the move last week, opening a one-week consultation period with Congress. Lawmakers were broadly supportive of it but congressional Iran hawks are now expressing concern that the administration may extend waivers on oil and nuclear sanctions.
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