A man charged with assault for throwing a sandwich at a federal agent calls it an act of protest. Prosecutors are trying to prove that it was a federal crime. Jurors heard attorneys' opening statements on Tuesday for Sean Charles Dunn's trial in Washington, D.C. on a misdemeanor assault charge. Customs and Border Protection Agent Gregory Lairmore was the trial's first witness. He testified that Dunn threw the subway-style sandwich at his chest with enough force that he could feel the impact through his ballistic vest.