Disclaimer: US border control, including in this case, is in my view terrible, unjust, and counterproductive. That being said: There's a weird "OMG A JOURNALIST WAS HASSLED!" angle to the story that, frankly, smells of aristocratic entitlement. Journalists aren't some superior class entitled to swan about the world freely while us filthy plebeians wait in line for toilet paper; at least in America, they're citizens w…
The border problems journalists have are mostly not connected to their 1st amendment rights (which, after all, only operate for journalists inside the US) but are about protecting sources.
Many of the US states have laws to protect journalistic materials and journalist's sources.