uspol, alerts
I'm pretty sure we can thank, not Trump (hard as that may be to accept), but Dubya Bush for the unblockable Presidential Alert part of the Emergency Alerts feature.
It's been in cell phones for many, many years, and I'm certain it was part of the aftermath of That Day.
uspol, alerts
Ah, it *was* Dubya, but much later than I remembered. The FCC mandated it in order to comply with the WARN Act back in 2007: https://en.wikipedia.org/wiki/Wireless_Emergency_Alerts