WASHINGTON (AP) — 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.

“Because of the fact that Rosie O’Donnell is not in the best interests of our Great Country, I am giving serious consideration to taking away her Citizenship,” Trump wrote in a social media post on Saturday. He added that O’Donnell, who moved to Ireland in January, should stay in Ireland “if they want her.”

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But O’Donnell’s situation is notably different from Musk, who was born in South Africa. O’Donnell was born in the United States and has a constitutional right to U.S. citizenship. The U.S. State Department notes on its website that U.S. citizens by birth or naturalization may relinquish U.S. nationality by taking certain steps – but only if the act is performed voluntary and with the intention of relinquishing U.S. citizenship.

Amanda Frost, a law professor at the University of Virginia School of Law, noted the Supreme Court ruled in a 1967 case that the Fourteen Amendment of the Constitution prevents the government from taking away citizenship.

“The president has no authority to take away the citizenship of a native-born U.S. citizen,” Frost said in an email Saturday. “In short, we are nation founded on the principle that the people choose the government; the government cannot choose the people.”