One day after former Columbia University graduate student Mahmoud Khalil was released from the immigration detention center where he had been held for three months, the anti-Israel activist appeared at a rally in New York City organized by a group accused of ties to the Iranian regime protesting the  U.S.’ weekend airstrikes on Iran’s nuclear facilities.

“Mahmoud Khalil is a freedom fighter … who refuses to remain silent while watching a genocide in Palestine,” Khalil told a cheering crowd on Sunday, where he led anti-Israel chants including, “From the River to the Sea, Palestine Will be Free,” at the People’s Forum protest, a demonstration organized by the National Iranian-American Council to protest the U.S. military strikes on three Iranian nuclear sites.

Iranian dissidents and critics of NIAC, a U.S.-based Iranian-American advocacy group that calls for diplomacy with the Iranian regime and was critical of the Biden administration’s approach to Israel and the Middle East, accuse the group of being tied to the regime. 

Khalil, who grew up in Syria but is of Palestinian descent and living in the U.S. on a green card, led last year’s anti-Israel campus protests at Columbia against the war in Gaza and subsequent negotiations with university administrators. He was detained in March and released on Saturday after U.S. District Judge Michael Farbiarz said it would be “highly, highly unusual” for the government to continue detaining a legal U.S. resident who was unlikely to flee and hadn’t been accused of any violence. 

Khalil’s release was met with support from some left-wing lawmakers.

Rep. Alexandria Ocasio-Cortez (D-NY), who met Khalil at New Jersey’s Newark-Liberty International Airport a day after he was freed from a federal immigration facility in Louisiana, said that his detention by the Trump administration violated the First Amendment and was “an affront to every American.”

“He has been accused, baselessly, of horrific allegations simply because the Trump administration and our overall establishment disagrees with his political speech,” Ocasio-Cortez added. 

Rep. Jerry Nadler (D-NY) wrote on X that he welcomed the decision to release Khalil. “As I have said before, his prolonged detention — without charges — is a chilling, McCarthyesque action in response to the exercise of First Amendment rights to free speech and raises serious constitutional concerns,” Nadler said.