Fox News legal analyst Andrew Napolitano said if President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE winds up being able to overturn ObamaCare, it would be “politically catastrophic” for the GOP.

Appearing on Fox News's “America’s Newsroom” on Monday, Napolitano said it would be bad for the Republican Party for ObamaCare to be abolished because so many people already rely on it for health insurance.

"You have 21 million people in the United States receiving government-subsidized health insurance as a result of ObamaCare,” Napolitano said. “You're gonna take that away from them? It'll be politically catastrophic.”

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Trump recently has made repealing ObamaCare, officially called the Affordable Care Act, a central message as he begins to campaign for reelection in 2020.

Last week, Department of Justice officials sided with a district court that ruled ObamaCare unconstitutional.

The move from the Justice Department marked an escalation of the Trump administration's battle against the health care law put in place by Trump’s predecessor.

Several Republican lawmakers have urged Trump to leave ObamaCare intact.

"Politically for the Republicans, it's an enormous problem," Napolitano said.

He added that he believes some Republicans are hoping Trump loses the court battle over ObamaCare “because they don’t have anything to replace it. And they can't physically get something done between now and the 2020 campaign."