Donald Trump posted on Saturday that he is giving “serious consideration” to revoking Rosie O’Donnell’s citizenship. The president posted on Truth Social, “Because of the fact that Rosie O’Donnell is not in the best interests of our Great Country,

President Donald Trump says he is considering “taking away” the U.S. citizenship of a longtime rival, actress and comedian Rosie O’Donnell, despite a decades-old Supreme Court ruling that expressly prohibits such an action by the government.

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

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.

If U.S. citizenship for Puerto Ricans is no longer secure, then neither is the colonial arrangement that produced it.

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.