[firic]

> it would strip citizenship from the children of green-card holders and illegal immigrants alike, leaving millions of American citizens suddenly without a country.

Would it take a person with citizenship and remove their citizenship, or would it simply not grant them citizenship?

[jkaplowitz]

What it would purport to do depends on the precise wording.

What it would actually do is get quickly struck down by the courts with no effect, since executive orders can't validly contradict federal statutory law or the Constitution.

Both sources of law currently protect birthright citizenship, except for the children of foreign diplomats who already don't benefit from it today (no new executive order needed).