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FOUNTAIN HILLS, AZ - MARCH 19: Republican presidential candidate Donald Trump speaks to guest gathered at Fountain Park during a campaign rally on March 19, 2016 in Fountain Hills, Arizona. Trumps visit to Arizona is the second time in three months as he looks to gain the GOP nomination for President. (Photo by Ralph Freso/Getty Images)
FOUNTAIN HILLS, AZ - MARCH 19: Republican presidential candidate Donald Trump speaks to guest gathered at Fountain Park during a campaign rally on March 19, 2016 in Fountain Hills, Arizona. Trumps visit to Arizona is the second time in three months as he looks to gain the GOP nomination for President. (Photo by Ralph Freso/Getty Images)

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    Trump campaign manager involved in altercation

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Trump campaign manager involved in altercation

Friday night Donald Trump's campaign manager was involved in an altercation, and Brian Stelter studied the impact Donald Trump is having on viewers.

Trump campaign manager involved in altercation

Friday night Donald Trump's campaign manager was involved in an altercation, and Brian Stelter studied the impact Donald Trump is having on viewers.