A former adviser for GOP presidential candidate Donald Trump said Friday he is planning massive “days of rage” protests outside the Republican convention in Cleveland if the party tries to “steal” the nomination away from Mr. Trump.

Roger Stone, who left the Trump campaign in August, tweeted several times Friday evening about his plans, announcing a “Stop the Steal March on Cleveland” and calling on supporters to get to the city for the convention in July.

“Stop the Steal March on Cleveland! @realDonaldTrump supporters- drive, hitch-hike, bus or fly to ‘the Forest City’ July 18-21,” Mr. Stone tweeted.

In addition, Mr. Stone told Buzzfeed that he is planning “#DaysofRage,” a reference to the 1969 Weatherman-organized Days of Rage protests in Chicago.

Mr. Stone said the protests will be “organized by Trump nation,” and that they will “stage protests at hotels of state delegates of states supporting the BIG STEAL.”

In an interview with GQ this week, Mr. Stone said a stolen nomination from Mr. Trump would cause extreme anger among his supporters.

“I think there’d be extreme anger by the Trump supporters. I don’t know that it would boil over into violence. Trump is certainly not advocating violence,” he said.

Mr. Trump has come under fire in recent months for protests that have escalated into violence at his rallies, including and incident where a supporter sucker-punched a protester in the face.

According to Cleveland.com, police have been stocking up on riot gear, using a $50 million federal security grant, in anticipation of possible unrest at the convention.

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