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A American border officer has stated under oath he could sense through his protective gear the force of a food product hurled at him by a DC demonstrator, who has faced court proceedings for assault.

Federal border agent Gregory Lairmore informed the jury the sandwich "exploded all over him" and he "noticed the aromatic vegetables and mustard" on his work clothing.

No party disputes that Sean Dunn, in his thirties, did in fact throw profanities and a made-to-order snack at authorities assigned by the administration to patrol the nation's capital in August.

The occurrence was filmed on camera and went viral, making Mr Dunn a figure of protest in Washington DC to Trump.

Federal attorneys at first tried to obtain felony charges against the defendant, but a legal panel declined to prosecute him.

The administration's deployment of National Guard troops to the federal district this summer caused anger from some of the city's residents, who viewed it as a partisan deployment of the military.

According to legal filings, Mr Dunn walked up to a law enforcement team at about 11 PM on August 10, describing them "authoritarians" and yelling: "What is your purpose? I don't want you in my city!"

The legal proceeding saw a reenactment from Mr Lairmore on the trial day as he testified against Mr Dunn.

"I detected it through my protective gear," he said of the sandwich's impact, noting that an aromatic fragment hung from his communication device and mustard stained his uniform.

The defendant's attorney, the defense attorney, argued in her opening statement that hurling the food item was a "innocent action that did not, could not, cause injury".

But government attorney the state's representative argued the accused must be facing consequences.

"No matter who you are, you cannot simply throwing stuff at people because you're upset," the prosecutor said.

Subsequent to the alleged assault became public, the defendant was fired from his position as a law firm employee in the Department of Justice.