The deputies are accused of failing to act as a white man sucker-punched a black protester at the March 9 rally, according to USA Today. The protester, Rakeem Jones, was initially taken into custody, but the alleged assailant, John McGraw, 78, was not. McGraw – who told "Inside Edition" he enjoyed "knocking out the hell out of [Jones'] big mouth" and "the next time we see him, we might have to kill him" – has been charged with assault and disorderly conduct in the incident.

>> RELATED: You won’t believe what this Trump supporter said about the protester he sucker-punched

"We regret that any of the circumstances at the Trump rally occurred, and we regret that we have had to investigate all of these matters," Butler said in a statement. "Yet, it is our duty and responsibility to do justice, and to carefully examine not only the actions of others, but our own actions to ensure that the law and our policies are justly and fairly enforced based in principle and without other influences."

>> Click here to read Butler's statement