An illegal migrant from Nicaragua allegedly raped a 54-year-old woman in Chicago after he dragged her into an alley, stripped her naked and bashed her head into the concrete, the feds said.

Leyter Arauz-Medina, 21, has been in custody since he was arrested last month over the sick attack that unfolded on Aug. 31 in the Windy City’s Belmont Cragin neighborhood.

Immigration and Customs Enforcement officials officially lodged an arrest detainer — a formal request for local cops to notify the feds before he is cut loose — for him on Wednesday. 3

Chicago, however, is a sanctuary city — meaning authorities are prevented from honoring ICE requests.

“A real-life nightmare: This criminal, who JB Pritzker continues to protect, viciously attacked an innocent woman who was walking the streets

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