TAMPA, Fla. (AP) - Federal prosecutor Robert O'Neill has been sworn in as the new U.S. Attorney for the Middle District of Florida.

O'Neill took the oath of office Tuesday during the lunch break of a fraud trial he was working on. He says he plans to continue trying cases himself, explaining that it's important to lead by example.

The 53-year-old lawyer will supervise a staff of 255, including 110 prosecutors, with offices in Tampa, Orlando, Jacksonville, Ocala and Fort Myers. The Middle District of Florida covers 35 counties.

The U.S. Senate last week confirmed President Obama's nomination of O'Neill, and the president signed the paperwork Monday.

O'Neill has worked for the U.S. Attorney's Office in Tampa for 17 years. He succeeds A. Brian Albritton.