If the author of the original tweet just wanted to say big "fracture", he would have said "big fracture" or "acrimonious fracture". Instead, he opted for the words "Civil War" like fracture. The obvious implication and intent is that Trump's retweet is both his approval of the tweet, and he's trying to rally his base - largely Southern folks - and threatening that a new civil war will result if he's impeached. This ain't rocket science. It's obvious and implicit to anyone and everyone with any common sense.
It's about as subtle as Rep. King's meme.
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