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A US immigration agent has stated under oath he could sense through his ballistic vest the force of a sandwich hurled at him by a DC demonstrator, who has faced court proceedings for assault.

Federal border agent Gregory Lairmore told the court panel the food item "exploded all over him" and he "noticed the vegetables and yellow sauce" on his official attire.

Neither side challenges that Sean Dunn, in his thirties, did in fact lob profanities and a deli-style sandwich at officers assigned by the administration to monitor the federal district in late summer.

The incident was captured on recording and went viral, making the defendant a representation of dissent in Washington DC to Trump.

State lawyers initially tried to achieve serious criminal counts against Mr Dunn, but a grand jury chose not to indict him.

Trump's assignment of National Guard troops to the federal district this summer caused anger from some of the DC citizens, who considered it a politicisation of the armed forces.

Based on charging documents, the defendant came near a police contingent at about 11 PM on the summer date, calling them "fascists" and shouting: "Why are you here? You are not welcome in my city!"

The legal proceeding observed a demonstration from the officer on Tuesday as he took the stand against Mr Dunn.

"I could feel it through my ballistic vest," he said of the item's force, noting that an vegetable piece remained from his police radio and condiment marked his shirt.

Mr Dunn's lawyer, the defense attorney, stated in her initial argument that hurling the sandwich was a "harmless gesture that did not, could not, result in harm".

But prosecutor the state's representative maintained the defendant must be considered responsible.

"No matter who you are, you can't just go around hurling objects at individuals because you're upset," Mr Parron said.

After the reported incident came to light, the defendant was terminated from his job as a legal assistant in the federal legal agency.