Attorneys general from 22 states sued Tuesday to block President Donald Trump's move to end a century-old immigration practice known as birthright citizenship guaranteeing that U.S.-born children are citizens regardless of their parents’ status.

Trump's roughly 700-word executive order, issued late Monday, amounts to a fulfillment of . But whether it succeeds is far from certain amid what is likely to be a lengthy legal battle over the president's immigration policies and a constitutional right to citizenship.

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