There is an old saying:
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"Never pick a fight with people who buy ink by the barrel" - Mark Twain
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Donald Trump needlessly and foolishly chose to pick a fight with the Press.  That is a cardinal error in a democracy.
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Is he a coward for now choosing to run away?
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Well, people can make up their own minds.  It may be fair comment.
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These are the consequences of his own choice:  He picked this fight, himself.