Trump tweeted Monday that he might accept his party's nomination either at the White House or "The Great Battlefield of Gettysburg" in Pennsylvania. But ethics experts point out that accepting the nomination on the Civil War battlefield would represent conducting partisan business on federal property. "The president is not subject to the Hatch Act, a Depression-era law that prohibits federal employees from engaging in political activities while on the job. But everyone who works for him is," according to The New York Times' Michael M. Grynbaum and Annie Karni. "By delivering a speech with the Gettysburg battlefield as a backdrop, experts said, Mr. Trump would risk putting park rangers and other park employees at risk of a violation." Norman L. Eisen, who served as President Obama's chief ethics czar, adds: “The park rangers will appear as political window dressing at the event. No normal president of either party would even try it, and no normal White House or campaign lawyers would support it.” ALSO: Gettysburg is sacred ground -- it shouldn't be defiled with partisan political event.