Among many problems with Trump's citizenship executive order (such as its obvious conflict with the constitution) is a practical one: birth certificates, which are currently the primary proof of citizenship for those born in the US, are issued by state and local authorities. These agencies do not (and aren't equipped to) determine or record the immigration status of the parents.

This means that citizenship would no longer be established with a US birth certificate or any other primary document.

@mattblaze There's precedent for this kind of chaos. Thousands of US citizens born in South Texas (including a family member of mine) have been denied passports (or passport renewals) in recent years because of incredibly broad assertions of document fraud by midwives in the 1950s and 1960s, assertions that are very difficult to challenge. https://www.texasstandard.org/stories/thousands-of-u-s-citizens-in-south-texas-have-been-denied-passports/
Thousands Of U.S. Citizens In South Texas Have Been Denied Passports

The State Departments cites charges that some midwives produced fraudulent U.S. birth certificates as far back at the 1960s as the reason for denying passports to many who were born along the Texas-Mexico border.

Texas Standard