The number of Americans renouncing citizenship and green card holders ending U.S. tax residency spiked earlier this year.

The ruling raised concerns that babies already defined as citizens by the Supreme Court could have their citizenship revoked under an order the president signed in August.

A federal judge has temporarily blocked a Trump executive order that would prevent certain people from automatically becoming U.S. citizens at birth.

The State Department has proposed requiring parents applying for passports for their children to provide proof of their own citizenship or immigration status.