The question is whether this judges's strong identification with his ethnic group would bring bias into his sitting as judge in a case where the defendant has taken stances strongly opposed by Mexican activists and members of the organization the judge is associated with.
Trump has insisted that he is not against Mexican-Americans and expects to do very well with Mexican-American voters; he says he is only against illegal aliens. The judge was born in Indiana and spent most of his career prosecuting Mexican border-jumpers and drug smugglers. So where is the bias?