Newark Mayor Ras Baraka said federal prosecutors tried to “humiliate and degrade” him by making him give his fingerprints and take a mug shot for a second time Thursday after a court appearance on a trespassing charge stemming from his arrest at an immigration detention center he was protesting.

Ras Baraka, the mayor of Newark and a candidate for New Jersey governor, appeared in federal court on Thursday, nearly a week after he was charged with trespassing.