WASHINGTON —

Throwing a sandwich at a federal agent turned Sean Charles Dunn into a symbol of resistance against President Donald Trump’s law-enforcement surge in the nation’s capital. This week, federal prosecutors are trying to persuade a jury of fellow Washington, D.C., residents that Dunn simply broke the law.

That could be a tough sell for the government in a city that has chafed against Trump’s federal takeover, which is entering its third month. A grand jury refused to indict Dunn on a felony assault count before U.S. Attorney Jeanine Pirro’s office opted to charge him instead with a misdemeanor.

Securing a trial conviction could prove to be equally challenging for Justice Department prosecutors in Washington, where murals glorifying Dunn's sandwich toss popped up virtually overn

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