(Vahid Salemi | The Associated Press) In this Feb, 11, 2019 file photo, Iranian Revolutionary Guard members arrive for a ceremony celebrating the 40th anniversary of the Islamic Revolution, at the Azadi, or Freedom, Square, in Tehran, Iran. President Donald Trump's administration is preparing to designate Iran's Revolutionary Guard as a "foreign terrorist organization." It's an unprecedented move that could have widespread implications for U.S. personnel and policy in the Mideast and elsewhere. U.S. officials say an announcement is expected Monday.