Is this a tipping point or bluster?

Donald Trump is finally trying to temper the ICE crackdown in Minneapolis which has seen the shooting deaths of two protesters at the hands of federal agents.

But why did he let it go so far in the first place? 

Today, Claire Finkelstein, a law professor at the University of Pennsylvania on what Trump’s really trying to achieve and why the events mirror the lead up to a civil war. 

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Claire Finkelstein, professor of law and professor of philosophy at the University of Pennsylvania