With midterm elections just a few days away, Trump is trying to keep enthusiasm for the party high and excite his base by bringing the conversation back to immigration, said Louis DeSipio, professor of political science at UC Irvine. “He can show his commitment to the values of the core of the Republican electorate by articulating a harsh, nationalistic, anti-immigrant message,” DeSipio said. [Subscription required, you can request an electronic copy of the article by sending an email to communications@uci.edu.]

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