On September 24, 2012, Horner was running for re-election when he suddenly resigned from the Florida House of Representatives after his name surfaced on a list of brothel clients in evidence against an accused prostitution ring leader.

[2] In his resignation statement, Horner said "I deeply regret decisions I made that are causing my family unjustifiable pain and embarrassment.

The altercation occurred on May 17, when Horner and Osceola County School Board District 3 member Jon Arguello both attended a fundraiser for State Attorney Andrew Bain.

Arguello confronted Horner regarding his link to a prostitution ring, and began to record him.

Publicly available video shows Horner grabbing Arguello, threatening him and later calling the police, falsely claiming assault.