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A US immigration agent has testified he could feel through his ballistic vest the collision of a deli item thrown at him by a DC demonstrator, who has gone on trial for criminal charge.

Federal border agent the government official told the jury the sandwich "exploded all over him" and he "detected the onions and mustard" on his uniform.

Both legal teams contests that Sean Dunn, 37, did in fact throw obscenities and a made-to-order snack at officers deployed by President Donald Trump to secure the Washington DC in the summer month.

The event was recorded on video and spread across the internet, making the defendant a figure of dissent in Washington DC to the administration.

Government prosecutors at first tried to obtain serious criminal counts against the accused, but a judicial committee declined to indict him.

Trump's sending of armed forces to Washington DC this season caused anger from some of the local inhabitants, who viewed it as a partisan deployment of the armed forces.

Based on charging documents, the accused walked up to a police contingent at about 23:00 on August 10, calling them "authoritarians" and exclaiming: "Why are you present? You are not welcome in my city!"

The court witnessed a demonstration from the agent on the trial day as he took the stand against Mr Dunn.

"I sensed it through my ballistic vest," he testified of the item's force, adding that an vegetable piece hung from his police radio and mustard stained his clothing.

Mr Dunn's legal counsel, his legal representative, said in her court presentation that launching the food item was a "innocent action that did not, could not, cause injury".

But government attorney the prosecutor said the accused must be facing consequences.

"Regardless of identity, you cannot simply hurling objects at others because you're angry," Mr Parron stated.

Subsequent to the alleged assault became public, Mr Dunn was terminated from his job as a legal assistant in the Department of Justice.