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Chicago Mayor Rahm Emanuel told police not to arrest violent, anti-Trump rioters, cop sources say
[BizPacReview] The protests which broke out ahead of Donald Trump’s Chicago campaign rally last week quickly became violent riots when Bernie Sanders supporters and members of the Black Lives Matter movement joined forces to shut down the event.

According to Ann Coulter, sources inside the Chicago Police Department were apparently told by Chicago Mayor and notorious liberal Rahm Emanuel not to arrest any of the violent rioters at the Trump rally.
Trump, undoubtedly, got wind of this and thought it would be prudent to canx. I agree.
Posted by: Blossom Unains5562 2016-03-15
http://www.rantburg.com/poparticle.php?ID=449012