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WASHINGTON — President said he is considering "taking away" the U.S. citizenship of a , actor 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 Saturday. He added that O'Donnell, who moved to Ireland in January, should stay in Ireland "if they want her."

The two criticized each other publicly for years, an often bitter back-and-forth that predates Trump's involvement in politics. On social media in recent days, O'Donnell denounced Trump and recent moves by his administration, including the signing of a massive Republican-backed tax breaks and spending cuts plan.

It's not the first time Trump threatened to revoke the citizenship of people with whom he publicly disagreed; most recently, he also targeted his former adviser and one-time ally, .

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. that U.S. citizens by birth or naturalization may relinquish U.S. nationality by taking certain steps — but only if the act is performed voluntarily 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."

O'Donnell moved to Ireland after Trump defeated Democratic Vice President Kamala Harris, winning his second term. She said she's in the process of obtaining Irish citizenship based on family lineage.

Responding to Trump on Saturday, O'Donnell wrote on social media that she upset the president and "add me to the list of people who oppose him at every turn."