The law, known as Proposition 200, was passed via referendum in 2004. Its supporters say it’s necessary to combat voter fraud, while its detractors say it threatens to disenfranchise certain groups, including minorities and the poor.

The Supreme Court’s decision will have far reaching implications. Since 2008, about 15 states have passed laws requiring potential voters to show identification before they vote. The Arizona law is slightly different, however, in that it centers on actual proof of citizenship, not just photo identification.

Read the full article from the Washington Times here.