WASHINGTON — The trial of a former U.S. Justice Department staffer who hurled a sandwich at a federal agent during President Donald Trump’s police crackdown in Washington D.C. began on Tuesday with a federal prosecutor telling a jury, “You can’t go around throwing stuff.”

Sean Dunn is facing a misdemeanor assault charge in a case that drew widespread attention after video of the encounter went viral. Dunn, who worked on international cases at the Justice Department, became an unlikely symbol of resistance to Trump’s law enforcement surge in the U.S. capital and was scorned by Trump administration officials.

Dunn has pleaded not guilty.

“This case is about the fact that you can’t go around throwing stuff at people when you’re mad,” prosecutor John Parron said during opening statements.

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