They would need to sign a contract with the Feds to never seek citizenship.
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Oh sure...
The ACLU would make mincemeat of that idea...
Just ad-libbing here but the law could include an auto-matic repeal clause that repeals the entire law if a court throws out the non-citizenship clause.
In real life anything that gets passed will be a piece of crap and Romney is completely untrustworthy as w Boehner and McConnell.