Jimmy C. Patiño Jr. is used to discussing difficult topics with students.  Patiño, an assistant professor of Chicano and Latino studies at the University of Minnesota-Twin Cities, does research that focuses on racial and ethnic studies, so sensitive subjects often come up in class.  But the debate over the now-halted policy from President Trump that had separated about 2,300 children from their parents when crossing the U.S-Mexico border is different, he said.