FILE - In this May 10, 2017, file photo provided by the Los Alamos National Laboratory, U.S. Secretary of Energy Rick Perry, second from left, accompanied by Laboratory Director Charlie McMillan, second from right, learns about capabilities at the Los Alamos laboratory's Plutonium Facility, from Jeff Yarbrough, right, Los Alamos Associate Director for Plutonium Science and Manufacturing, in Los Alamos, N.M. Secretary Perry once again visited a site where weapons-grade plutonium is stored, and low-level radioactive material was mistakenly sent for years. Perry confirmed his team gave Gov. Steve Sisolak classified and unclassified briefings during a tour of the Nevada National Security Site Thursday, Aug. 1, 2019. (Los Alamos National Laboratory via AP, File)
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