And, I don't know how accurate the anecdotes are beyond the well-established accounts from MSM...But, I would sure as hell do my homework including how to travel with a burner phone or scrape my phone of any traces of content that could be "gleaned" and probably travel with my contacts list in an encrypted app on a nearly blank iPad or printed out in tiny font and hidden in a shoe, carry-on luggage lining or something of that nature. Sounds really paranoid, but...
And, I would have numbers for ACLU in multiple states as well as your personal lawyer (and if they can provide, an emergency name of a well-versed immigration lawyer--even though obviously you are a citizen). In Colorado, the local ACLU has an app (probably elsewhere too) where you can be filming video that automatically downloads to a direct online website that precludes TSA or Customs/Border Control or others from deleting.
Ironically, my parents were in Iran with a western company before the Shah was deposed and as a young teen, my sister and I were warned constantly of all the things we were never to do for fear of someone overhearing us or other reprisals. That included jokes about the Shah or the country (we'd never even think about making impolite comments about the people, nor Muslims, nor anything similar, so I won't even mention that). We were told not to even write the name of the Shah or any other official on a postcard going out and certainly not to joke about drugs or anything similar. This was 1978 or so and my sister and I traveled back and forth several times--always happy to be going, but very paranoid as well. Teen children of other US workers had been detained and deported for any number of things (probably mostly drugs) but the message was sent. Neither of us relaxed until we were back in the US .
I now feel like we are living in Iran of that era. And that was before the time of cell phones and laptop computers. Yikes...