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I suspect that the US has a coordinated campaign plan for Iranian regime change, including Israel and Saudi Arabia.
Withdrawing from the the Iran deal opened the door to overt and covert action against that regime - D-Day.
(D+1) Israeli missiles strike Iranian Republican Guards and Iranian surrogates in Syria, within hours.
What are Mossad, CIA, the Saudis and others doing? My guess is that more is going on, that is less visible, and that more visible actions are coming in phases.
Time to sell any stock in the existing regime, their days are numbered (D+x).