Former Democratic presidential candidate Bernie Sanders said Wednesday he was "sickened" by what he called a "despicable act" after a man who volunteered for his campaign opened fire at a congressional baseball practice outside Washington, wounding four people including House Majority Whip Steve Scalise.

According to Sanders' statement, the suspect, James T. Hodgkinson, "apparently volunteered" on his 2016 presidential campaign. Hodgkinson has since died from his wounds after shooting four, including Louisiana Rep. Steve Scalise early Wednesday in Alexandria, Va.

"I have just been informed that the alleged shooter at the Republican baseball practice is someone who apparently volunteered on my presidential campaign," said Sanders, a Vermont Independent. "I am sickened by this despicable act. Let me be as clear as I can be: Violence of any kind is unacceptable in our society and I condemn this action in the strongest possible terms. Real change can only come about through nonviolent action, and anything else runs against our most deeply held American values."

The Belleville News-Democrat reported that in 2006, Hodgkinson was arrested "on suspicion of battery, domestic battery, criminal damage of property and reckless discharge of a firearm." The charges were dismissed.

On his apparent Facebook page, Hodgkinson presented himself a supporter of Sanders and a longtime critic of the GOP.