Judge Susan bolton

In short, she found that federal law trumps the struck-down parts of Arizona's law because they imposed burdens on legal immigrants that only the federal government can impose, and because the law would force the U.S. government to reallocate resources away from its priorities, something states can't do.

U.S. District Court Judge Susan Bolton threw a monkey wrench into the deeply contentious debate over illegal immigration by declaring parts of Arizona's controversial immigration law to be unconstitutional. Backers of the bill, including Arizona Gov. Jan Brewer, vow to keep fighting.