A University of Pennsylvania senior administrator is under fire for reposts and a controversial post of his own on X following Turning Point USA founder Charlie Kirks assassination.The white on white violence has gotten out of hand," Professor Michael E. Mann, the director for the Center for Science, Sustainability & the Media, wrote in a now-deleted X post.He also retweeted multiple posts slamming Kirk, including one from Max Granger mocking Ezra Kleins New York Times column on the conservative activist, which said "Ezra Klein: I had my differences with the head of Trumps Hitler Youth, but we both wanted the same thing: to make America great again."FLASHBACK: CHARLIE KIRK WARNED OF LEFT-WING 'ASSASSINATION CULTURE' MONTHS BEFORE HIS MURDERHe retweeted another post on Kleins "Charlie Kirk Was Practicing Politics the Right Way" column, dubbing it "whitewashing Kirks legacy. Mann himself posted that Utah Gov. Spencer Cox "was all thoughts and prayers in the press conference" and included a link to Everytown, a gun control advocacy group, regarding a bill Cox previously signed.His posts got the attention of conservative commentators as well as Sen. Dave McCormick, R-Penn."This is despicable behavior. This dangerous rhetoric cannot and will not be tolerated. I will unequivocally Comden this behavior and demand UPenn take immediate, decisive action," McCormick wrote.SPORTS OUTLET SEVERS TIES WITH SUNS BEAT WRITER OVER CHARLIE KIRK ASSASSINATION POSTS"When people in positions of power, like [Mann], continually demonize their political opponents, calling them "nazis and "threats to democracy," they cannot act shocked when people act on their inflammatory rhetoric," Will Hild, executive director of Consumers Research, posted. "This is wholly unacceptable, [University of Pennsylvania]. Fire him."Zach Parkinson, a GOP communications director, pointed out Manns past Democratic ties, including being praised by former Secretary of State Hillary Clinton in 2024 on climate policy and being listed as a guest at a "Humanists for Harris" event hosted in Oct. 2024 by the Secular Democrats of America."Mann isnt some random lefty Twitter troll. Hes a part of the Democratic establishment." Parkinson wrote. "Hes been repeatedly invited by Democrats to testify in front of Congress, was an advisor to Hillary Clintons 2016 campaign, and is regularly featured by Democrats at political events."CHARLIE KIRK WARNED ASSASSINATION CULTURE IS SPREADING ON THE LEFT IN EERIE ONLINE POST MONTHS BEFORE MURDERConservative communicator Steve Guest called the reposts "absolutely ghoulish content."Mann attempted to clear the air following the backlash on Thursday."I reposted this earlier today. I was simply agreeing w/ the (widespread) criticism of Ezra Kleins claim that Kirk was practicing politics the right way. I do NOT approve of the inappropriate & inflammatory language used to describe Kirk (which Id overlooked. Have deleted," he said in regards to Grangers "Hitler Youth" remarks.CLICK HERE TO GET THE FOX NEWS APPIn another post, Mann wrote that he hopes "they catch him" when referring to the suspect in the Kirk Shooting."Political violence is completely unacceptable no matter what side it is on. I hope we can all agree with that," Mann wrote.Kirks assassination drew an outpouring of tributes for him and his family, but many people continue to fall into the spotlight for comments either praising or downplaying the tragedy.Fox News Digital reached out to the University of Pennsylvania, Mann and his public relations representative for comment.