In mid-February, as Department of Homeland Security Secretary Kristi Noem was fighting to keep her job, she held an election-security event at a Homeland Security Investigations field office in Scottsdale, Arizona. In the past, she said, the state had been an “absolute disaster on elections,” and ensuring the security of election equipment was her responsibility. She also urged Congress to pass President Trump’s voter-ID bill. The message was less surprising than the location. HSI, the agency’s investigative branch, devotes most of its efforts to going after transnational drug cartels and…