An Iranian man charged in D.C. with conspiracy and other offenses was so incensed by a U.S. senator who participated in a New York rally against the Tehran regime last fall that he suggested to his alleged co-conspirator that the “motherf—” needs to be shot, according to documents unsealed on Monday. Majid Ghorbani and Ahmadreza Mohammadi-Doostdar stand accused of having collected data for the regime relating to Jewish organizations in Chicago and U.S.-based members of the exiled Iranian opposition group, Mujahideen-e Khalq (MEK). They did so, according to an FBI special agent’s affidavit, “for the purpose of enabling the government...