White House senior adviser Stephen Miller on Sunday predicted that the Affordable Care Act will ultimately be struck down by the Supreme Court.

“I believe that’s the likeliest outcome, because ObamaCare has always been unconstitutional," Miller said on CBS's "Face the Nation."

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Miller's prediction came after a federal judge in Texas on Friday ruled that the Affordable Care Act is unconstitutional.

The ruling is likely to face legal challenges, and experts have said they expect the health-care law will not be impacted.

Miller, however, on Sunday called on Democrats "to work with Republicans" to pass a new law "once ObamaCare is ultimately struck down."

"We’ve always known that ObamaCare was unconstitutional. The more important question is whether Democrats are going to work with Republicans once ObamaCare is ultimately struck down, which we believe it will be, to come up with a replacement plan," he said.

President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE has touted the Texas ruling, by U.S. District Court Judge Reed O'Connor, as a political victory. In a tweet on Friday celebrating the ruling, he urged leaders in Congress to pass a law replacing the Affordable Care Act.

"As I predicted all along, Obamacare has been struck down as an UNCONSTITUTIONAL disaster! Now Congress must pass a STRONG law that provides GREAT healthcare and protects pre-existing conditions. Mitch and Nancy, get it done!" he tweeted.