It is, however, very unlikely the courts would strike down any effort by Congress to prohibit illegal residents from working or obtaining welfare benefits, including federal efforts to solicit or entice the states to cooperate in such efforts through the use of federal grants and mandates.

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Three Obama administration officials have told Congress that efforts by terrorists to recruit US residents are causing new national security threats.

BBC: US Congress warned of home-grown terrorism threat

The year before, Congress passed a law that terminated many tax benefits of foreign trusts established by U.S. residents, treating them more like domestic trusts.

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