Republican Sen. Susan Collins Susan Margaret CollinsSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (Maine) is urging Attorney General William Barr Bill BarrProsecutor says no charges in Michigan toilet voting display Judge rules Snowden to give up millions from book, speeches The Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy MORE to defend ObamaCare and reverse an earlier Justice Department decision.

In a letter, Collins expresses her “profound disagreement” with the department’s decision to side with a district court ruling that found the Affordable Care Act unconstitutional.

“This surprising decision goes well beyond the position taken by the Department last June" and puts a number of “critical consumer provisions” of the law at risk, she writes.

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The Justice Department's announcement marked a significant escalation of the administration’s renewed efforts to eliminate the law, with 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 seeking for the Republican Party to become “the party of great health care.”

Collins told Barr that the administration should approach Congress with proposed changes to the law or seek to repeal it again.

“The Administration should not attempt to use the courts to bypass Congress,” she writes.

Collins argues that while Congress struck down the individual mandate as part of its tax-reform law in 2017, it did not intend for protections for people with preexisting conditions to “stand or fall together with the individual mandate."

Republicans have yet to pass an alternative to ObamaCare, despite pushes to repeal and replace it. Acting White House chief of staff Mick Mulvaney Mick MulvaneyMick Mulvaney to start hedge fund Fauci says positive White House task force reports don't always match what he hears on the ground Bottom line MORE claimed Sunday that he can guarantee that Americans would not lose coverage if ObamaCare is struck down.

Collins, who is up for reelection next year and voted to confirm Barr, said last week that she was “surprised” and “appalled” by his decision on the health care law.

“I think the Justice Department has a duty to defend the duly enacted laws … I was surprised and disappointed," she said. "If the president disagrees with a law, then he should ask Congress to repeal or change that law. He should not try to get rid of it through the courts.”

Updated at 9:24 a.m.