A binder with highly classified information connected to Russian election interference disappeared at the end of Donald Trump's presidency, sparking concerns among intelligence officials that some of the nation and its allies' most tightly guarded national security secrets will be exposed, more than a dozen sources familiar with the matter told CNN.
The binder's disappearance was so alarming that intelligence officials briefed Senate Intelligence Committee leaders last year about the missing materials and the government's work to retrieve them, the sources told the outlet.
