Your concern is reasonable, and I've thought about it myself. The Wikipedia article linked downthread by int_19h notes: "Up to one percent of all those detained in immigration detention centers are nationals of the United States according to research by Jacqueline Stevens, a professor of political science at Northwestern University." There are specific cases mentioned in the article, and the case of Mark Daniel Lyttle was pretty alarming. It was written up in: https://www.newyorker.com/magazine/2013/04/29/the-deportatio...

On the other hand, you can't be detained without probable cause, and race/ethnicity alone isn't enough. For instance, the Supreme Court ruled in United States v. Brignoni-Ponce (https://case.law/caselaw/?reporter=us&volume=422&case=0873-0...): "In this case the officers relied on a single factor to justify stopping respondent’s car: the apparent Mexican ancestry of the occupants. We cannot conclude that this furnished reasonable grounds to believe that the three occupants were aliens. At best the officers had only a fleeting glimpse of the persons in the moving car, illuminated by headlights. Even if they saw enough to think that the occupants were of Mexican descent, this factor alone would justify neither a reasonable belief that they were aliens, nor a reasonable belief that the car concealed other aliens who were illegally in the country. Large numbers of native-born and naturalized citizens have the physical characteristics identified with Mexican ancestry, and even in the border area a relatively small proportion of them are aliens. The likelihood that any given person of Mexican ancestry is an alien is high enough to make Mexican appearance a relevant factor, but standing alone it does not justify stopping all Mexican-Americans to ask if they are aliens."

I second the recommendation to get a RealID. You're going to need one eventually for domestic flights, among other things. When I got mine at the DMV renewing my driver's license, they asked for a birth certificate, social security card, driver's license, and proof of (local) residency (e.g. utility bill). So why not get one and carry that as additional proof?

I'd recommend carrying a passport card instead of the actual passport. A REAL ID would be helpful as well.

I don't think the chances of something that drastic are high, but it doesn't hurt to err on the side of caution.

more people will become billionaires in the next four years than get deported :)

> deportation dragnet

Do you know how insane that sounds in this context? I absolutely despise Trump, make no mistake; but if you think Trump is rounding up any of the 40+% of the USA's non-white citizens and deporting them, you have been deluded by widespread FUD.

The "deportation dragnet" might apply to illegals, sure. Will any meaningful amount of US citizens get scooped up in that, if any? Highly, highly unlikely. You're probably more likely to be murdered.