I volunteered for a trial court judge during my first year of law school. There was one trial where the plaintiff was Mexican. Someone was asked about whether they had any bias against immigrants, and that lead to a general question to all of the jurors. One guy in his early twenties caught on quickly and started telling the attorney that he did not support anyone who came here illegally and that they shouldn’t have access to the courts. The judge asked him some questions and he answered in a way to make himself seem unable to be unbiased, so he got released by the judge.