National Intelligence Director Tulsi Gabbard decided to declassify a document on Russia's interference in the 2016 election last month over the objections of CIA officials who argued that more details should remain secret to protect sensitive spying sources and methods, according to two sources with knowledge of the matter. The Washington Post first reported the disagreement. Some former intelligence officers said they were alarmed at the detail revealed in the declassified document. The top Democrat on the Senate Intelligence Committee, Mark Warner, of Virginia, has warned that the move could put intelligence-gathering efforts at risk.