Trump defends deal with Mexico that critics say will do little to curb migrant crisis

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4. Trump declared victory early

because he knew that the GOP wouldn't back him up in the long run. He figures that if he gets credit for making the deal, he can get more credit for reworking it later on if it proves to be insufficient. Then, the GOP will be less likely to oppose him if he's shown that Republican voters give him credit for having made the attempt in the first place.