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A American border officer has testified he could detect through his protective gear the force of a sandwich launched at him by a capital city activist, who has gone on trial for criminal charge.

Federal border agent Gregory Lairmore told the legal jury the sandwich "burst all over him" and he "detected the onions and condiment" on his uniform.

No party disputes that Sean Dunn, in his thirties, did in fact hurl profanities and a prepared food item at officers deployed by President Donald Trump to monitor the Washington DC in the summer month.

The event was recorded on video and became popular online, making the defendant a symbol of dissent in the capital to the former president.

Government prosecutors originally tried to achieve serious criminal counts against Mr Dunn, but a grand jury refused to charge him.

The former president's sending of military personnel to Washington DC this warmer months generated protest from some of the city's residents, who considered it a politicisation of the military.

Based on charging documents, Mr Dunn came near a group of officers at about 11 PM on 10 August, referring to them "fascists" and yelling: "Why are you present? I don't want you in my city!"

The trial observed a re-enactment from the agent on the trial day as he took the stand against Mr Dunn.

"I detected it through my body armor," he testified of the item's force, noting that an aromatic fragment dangled from his official equipment and mustard discolored his uniform.

Mr Dunn's legal counsel, Julia Gatto, stated in her opening statement that hurling the deli product was a "non-threatening act that did not, could not, result in harm".

But government attorney the state's representative argued Mr Dunn must be considered responsible.

"Regardless of identity, you should not launching items at people because you're mad," the prosecutor stated.

Subsequent to the claimed attack became public, Mr Dunn was terminated from his employment as a legal assistant in the Department of Justice.