[El Conservador]

We could immediately rescind the citizenship of several million "anchor babies" among other things.

Constitution of the United states, Article I, Section 9; Clause 3:

No Bill of Attainder or ex post facto Law shall be passed.

As frustrating as it may sound, a law rescinding citizenship for anchor babies would be considered ex post facto, and declared unconstitutional.

[muawiyah]

Wouldn't be a new law ~ just an administrative determination based on law current when they were born. Simply require them to be added to the family's visa when they "visited" the US.

This goes on all the time.

Administrative error may be corrected without respect to the ex post facto law prohibition.

Think of it like the title to your home. You get insurance just in case someone made an administrative error a couple of centuries ago.

[TLI]

As frustrating as it may sound, a law rescinding citizenship for anchor babies would be considered ex post facto, and declared unconstitutional.

Yea, kinda like the Lautenberg Domestic Violence Amendment?