The “senior Russian intelligence officials” story James Comey was forced to shoot down in 2017 had four unnamed sources. So did one suggesting Trump was about to fire the Fed chair. Luke Harding had two for his recent Guardian bombshell about Paul Manafort supposedly having met with Julian Assange (that story is still unconfirmed). Some of these stories begin with a single high-ranking intelligence official speaking to a reporter (or team of reporters) at an esteemed paper like the Times or the Washington Post. The reporters might ask for additional confirmation. The official may give them
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