Freed Columbia University protester Mohsen Mahdawi was allowed to stride across the graduation stage Monday — just three weeks after being cut loose from an immigration jail. The 34-year-old, who was draped in a keffiyeh, paused in the middle of the stage as he listened to some of his fellow grads cheer him on. Mahdawi, a legal permanent resident for 10 years, was nabbed by the feds in Vermont on April 14 during an interview about finalizing his US citizenship. He ended up being released by a judge two weeks later — and used his graduation to attack the current administration.