Trump's tweet that got tagged for 'glorifying violence' used a phrase from a 1960s cop whose policies started a race riot

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Twitter on Friday tagged a tweet by President Donald Trump about protests in Minneapolis with a warning that it "glorified violence."

In the last line of the tweet Trump warned that "when the looting starts, the shooting starts."

The president seemed to have been quoting Miami police chief Walter Headley, whose harsh policing of African American neighborhoods sparked three days of riots in 1968.

Twitter said Trump's tweet "violates our policies regarding the glorification of violence based on the historical context of the last line."

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Early on Friday, Twitter escalated its feud with President Donald Trump in dramatic fashion labelling one of the president's tweets with a warning that it was "glorifying violence."

The president sent the message late Thursday about the sometimes-violent protests in the city of Minneapolis over a black man's death in police custody.See the rest of the story at Business InsiderNOW WATCH: We tested a machine that brews beer at the push of a buttonSee Also:Trump's executive order cracking down on 'online censorship' has nothing to do with free speechLegal and tech policy experts say Trump's draft executive order cracking down on social-media companies is dead on arrivalMark Zuckerberg told Fox News that Facebook would not fact-check Trump's false claims as Twitter did