A Secret Service agent on assignment in Iowa to help with presidential security has been arrested on suspicion of driving under the influence.

City Police Chief Bill Nixon says 40-year-old Daniel L. Valencia was arrested Saturday in Decorah. President Barack Obama visited the northeast Iowa city on Monday as part of his three-day Midwestern bus trip.

Nixon told Cedar Rapids television station KGAN that Valencia was off-duty when he was arrested. Nixon did not immediately return a call Wednesday from The Associated Press.

Secret Service spokesman George Ogilvee confirmed Wednesday that Valencia is an agent and that the matter had been turned over to the agency's Office of Professional Responsibility. Ogilvee would not comment further.

Online court records don't list an attorney for Valencia.