Comparing Watergate

FILE - In this March 19, 1974 file photo, President Richard Nixon pounds his fist during a news conference in Houston, Texas. In Watergate, the smoking gun was a White House tape proving that Richard M. Nixon ordered a cover-up, the final evidence that forced him from the White House. In the investigation of Russian interference in the 2016 presidential election campaign, the smoke hasn’t cleared because President Donald Trump keeps shooting. (AP Photo, File)