Paul Nungesser was found “not responsible” for sexually assaulting another student at Columbia University. The student who accused him, Emma Sulkowicz, has since began carrying a mattress around the university as part of an art project to protest a finding she claims was unfair.

Sulkowicz’s activism earned her an invitation to President Obama’s State of the Union address Tuesday night from Sen. Kirsten Gillibrand, D-N.Y. When Nungesser heard of the invitation, he blasted the senator for rewarding Sulkowicz’s attacks against him.

“I am shocked to learn that Sen. Gillibrand is actively supporting Ms. Sulkowicz’s defamation campaign against me by providing her with a public forum in which to broadcast her grave allegation,” Nungesser told New York Magazine on Tuesday. “By doing so, Sen. Gillibrand is participating in a harassment campaign against someone, who, for good reason, has been found innocent by all investigating bodies.”

Nungesser reminded people that the university, after a seven-month long investigation, found him not responsible in 2013 — even in the current atmosphere where colleges are encouraged to find students guilty to appease political interests. Nungesser also pointed out that he cooperated with police after Sulkowicz filed a report (after the university found him not responsible) and that prosecutors declined to pursue the case.