On October 25, as federal agencies, including the Secret Service, were on a fierce hunt for the person who sent pipe bombs to the Clintons, the Obamas, billionaire George Soros, and other Donald Trump critics, two Secret Service agents paid a visit to comedian and actor Tom Arnold and questioned him to determine if he posed a threat to the president. And they delivered Arnold a warning that was also highly appropriate for the man they are duty-bound to protect: Tweets can encourage violence.

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