A U.S. Supreme Court ruling last week could enable a Trump executive order restricting birthright citizenship. It could change who is considered a U.S. citizen, depending on what state a child is born in and their parents' immigration status.

The ruling left unsettled the question of whether children born to immigrants without full legal status in the United States are entitled to automatic citizenship. So what happens now?

Effective immediately, the Trump administration can begin planning for how it would implement an end to birthright citizenship.