Brooks was part of a group that took the issue before a heated City Council meeting earlier this week. FOP members say Brooks violated the charge of his office, which is to be fair and impartial to officers who came before him for disciplinary matters.
They're accusing him of coaching Madison prior to Monday's City Council meeting -- something Brooks denies.
Wednesday the FOP released a voicemail from Brooks, intended for Madison but was apparently was misdialed to an Evansville officer's phone. Members believe the voicemail suggests Madison was coached.
"You can listen to it for yourself. You be the judge. I think it's obvious in the phone call that he coached George Madison," said Larry Nelson, FOP President.
Brooks says the FOP needs to focus on the bigger picture. "Quit tripping because we disagree on something," said Brooks. "Quit trying to malign people over trivial voicemails and let's try to talk about the weightier matter."
The FOP is calling for both Brooks to and City Council President Connie Robinson to step down from their presidential positions. Brooks says he won't step down until his term ends December 31, 2015.