AMARILLO -- The Potter County Chief Deputy has resigned. Ken Farren says he can no longer work with Sheriff Mike Shumate because Shumate lacks integrity. Farren also announced he's running for sheriff. Farren claims allegations have been made against Shumate. The former chief deputy wouldn't elaborate about the allegations but he said they were enough to make him leave his post. Over the phone, Potter County Commissioner Joe Kirkwood says it's the FBI that's leading an investigation against Shumate. "I do believe the allegations alone have made it impossible for Mike to continue to be an effective leader for the sheriff's office. Because of the nature of the allegations I can no longer remain the second in command," says Farren. "I think gossip about what the investigation may be focused on or where it may be going or what the results might be are counter productive at this point and I would encourage everybody in Potter County to sort of stand down and let this process take whatever course it's going to take," says Scott Brumely the Potter County Attorney. We did have a chance to talk with Sheriff Shumate over the phone earlier today. He says he's not avoiding us and will talk to us later in the week. The FBI Office in Dallas will not confirm or deny any investigation of Sheriff Mike Shumate.