I never said he was singled out, or by race/ethnicity/color even. Whether this relates to Trump: As others have pointed out, yes this has been happening before

I never said he was singled out, or by race/ethnicity/color even. Whether this relates to Trump: As others have pointed out, yes this has been happening before Trump, I'm not alluding to Trump being the sole cause. The point that I'm making is that leaders (president and even local leaders) who can make statements or take actions that are contrary to the country's laws have an effect on the guy on the streets. If you tell me that foreigners are taking our jobs (regardless of its truth), I might not be very objective as a CBP employee. I might even be biased against certain people, but that's hard to judge as we are different as humans. The guy on the tweet said he was asked 10 other questions, and they seemed to expect textbook/Wikipedia type answers. A blog post from him will hopefully have more details for us to make better observations. You make a fair point about the physicist, but everything in moderation is fair. My point if any, is that what leaders/politicians say affects our attitude and often opinions. Whether we like such leader or not, I hope we can agree on that at least.