Democratic leaders are growing “frustrated” that the U.S. Army hasn’t produced an incident report about an altercation at Arlington National Cemetary purportedly involving members of Donald Trump’s campaign. A Democratic aide said officials have been asking for the report for nearly two weeks, Greg Sargent of The New Republic reported Tuesday. Lawmakers also want a play-by-play of what was said to the Trump campaign staffers before the incident. According to the reports, an altercation unfolded after a cemetery official told the campaign they couldn’t shoot photos or videos of the graves of Ir…