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A American border officer has testified he could sense through his ballistic vest the collision of a sandwich thrown at him by a Washington DC protester, who has gone on trial for assault.

Immigration and customs agent the officer testified to the jury the snack "burst all over him" and he "detected the onions and condiment" on his uniform.

No party disputes that Sean Dunn, thirty-seven, did in fact hurl profanities and a made-to-order snack at authorities deployed by the former president to patrol the Washington DC in August.

The event was recorded on video and became popular online, making the accused a figure of opposition in Washington DC to the former president.

State lawyers initially tried to obtain felony charges against the accused, but a judicial committee refused to charge him.

Trump's assignment of National Guard troops to Washington DC this summer sparked anger from some of the DC citizens, who considered it a partisan deployment of the troops.

Based on charging documents, Mr Dunn came near a law enforcement team at about 11 PM on the summer date, describing them "fascists" and yelling: "What is your purpose? You are not welcome in my city!"

The trial witnessed a reenactment from the officer on Tuesday as he took the stand against the accused.

"I sensed it through my ballistic vest," he testified of the item's force, noting that an aromatic fragment hung from his official equipment and mustard stained his clothing.

Mr Dunn's attorney, his legal representative, argued in her court presentation that launching the deli product was a "innocent action that did not, could not, create physical damage".

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

"Regardless of identity, you cannot simply launching items at others because you're upset," the prosecutor said.

Following the alleged assault was revealed, the accused was terminated from his position as a law firm employee in the Department of Justice.