Donald TrumpDonald John TrumpAssange meets U.S. congressman, vows to prove Russia did not leak him documents A history lesson on the Confederacy for President Trump GOP senator: Trump hasn't 'changed much' since campaign MORE's campaign manager, Corey Lewandowski, appeared to grab and pull a protester by his collar at a rally in Tucson, Ariz., Saturday. 

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In a video, Lewandowski and another man can be seen talking sternly to the protester. As the man tries to walk away, Lewandowski grabs him by the back of his shirt collar and yanks him backward. 

Lewandowski has been under fire for allegedly roughly grabbing former Breitbart reporter Michelle Fields at a campaign event, which the Trump camp denies. Fields resigned from Breitbart and filed criminal charges against Lewandowski.