Since the first days of his presidency, Trump has repeatedly pointed to crimes committed by immigrants in the country illegally to argue that the U.S. needs a border wall and tougher immigration policies. … University of California, Irvine, sociology professor Ruben Rumbaut co-authored a recent study that said crime rates fell sharply from 1990 to 2015 at a time when illegal immigration spiked. Crime rates were low in immigrant-rich and border cities like El Paso, Texas, and San Diego.

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