How Joseph McCarthy's trusted hitman Roy Cohn became Donald Trump’s mentor

He's been called "one of the most loathsome characters in American history." Roy Cohn made his bones working as a prosecutor in the Rosenberg espionage case, and served as Senator Joseph McCarthy's right-hand man for years. He helped send the Rosenbergs to the electric chair for spying, and helped Richard Nixon become president.

Roy Cohn was also Donald Trump's lawyer and mentor for 13 years.

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