Historically, protests against new presidents are not unusual, said David Meyer, a sociology professor at the University of California, Irvine, and author of "The Politics of Protest." "What is unusual is the vigor, speed, size, and number of issues that they're challenging Trump on," Meyer said. "To have a sustained (protest), every weekend, every couple of days, and it's a different issue -- I've never seen anything like this before."

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