Rosie O'Donnell might lose her citizenship if Donald Trump has a say. After she moved to Ireland, he threatened to revoke her citizenship and called her a 'threat to humanity'

Amid the uncertainty and potential changes in the naturalization process to be a U.S. citizen, here are five things to know.

On the Fourth of July, beneath a sun that seemed to soften just in time for the ceremony, one hundred immigrants reminded the crowd of the enduring allure of American citizenship as they swore their allegiance to the United States.

In 1967, the Supreme Court said the government usually cannot take away citizenship without a person’s consent.

In 1898, the Supreme Court ruled that the children of immigrants who were born in the United States had the right to citizenship—even if their parents weren’t citizens themselves. This is Wong Kim Ark’s story.

Birthright citizenship is specified by the 14th Amendment to the U.S. Constitution-"All persons born or naturalized in the United States"-and interpreted plainly by 150 years of Supreme Court precedent.