The opponent of a Republican congressman who posted a video of a Baghdad rocket attack on his Web site says the action might have aided insurgents whose subsequent attack killed two soldiers.

Lance Sigmon is challenging GOP Rep. Patrick McHenry in North Carolina's May 6 primary. Sigmon wants a congressional investigation of McHenry's decision to post the video, which included a description of the attack's success.

Sigmon is a former Air Force lawyer. He says it's important for the nation to know if McHenry "exploited an attack on our military to impress voters back home."

McHenry's spokesman has dismissed Sigmon's demands for the investigation, calling it a political gimmick.