In this March 9, 1950 file photo, Sen. Joseph McCarthy, R-Wis., gestures during a Senate subcommittee hearing on McCarthy's charges of communist infiltration of the U.S. State Department. President Donald Trump, tweeting over the weekend, invoked both McCarthyism and the Watergate scandal, two of the most-debated chapters of recent American political history. (AP Photo/Herbert K. White)
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