From Fortune:

His behavior goes against what we’ve seen from any other president, says Kevin Kosar of conservative think tank R Street Institute. As Kosar points out, Richard Nixon battled postal workers who illegally went on strike and Harry S. Truman criticized the steelworkers unions for threatening national security. The difference here is that Trump’s attack got personal.

“Both Nixon and Truman kept it civil, and did not trash union leaders by name,” he says.

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