Sen. Susan Collins Susan Margaret CollinsGraham: GOP will confirm Trump's Supreme Court nominee before the election Gardner signals support for taking up Supreme Court nominee this year Tumultuous court battle upends fight for Senate MORE (R-Maine), a key moderate, voiced concern Tuesday over a new slimmed-down Senate GOP healthcare plan that would repeal just a few core elements of ObamaCare, setting up a negotiation with the House.

The latest GOP idea is to scrap a few elements of the 2010 Affordable Care Act that almost all Republicans agree need to go: the mandates requiring individuals to buy and employers to provide insurance and the medical device tax.

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Republican senators are floating the bare-bones proposal as a backup in case legislation similar to the 2015 Senate-passed repeal-only bill and the revised Better Care Reconciliation Act, which would repeal and replace core pieces of Obamacare, both fail.

But while Collins supports repealing the individual mandate, which requires individuals to purchase insurance or face a penalty, she says that it must be replaced.

She wants to replace it with a bill she co-sponsored with Sen. Bill Cassidy (R-La.) that would allow states to auto-enroll uninsured individuals but also provide an opt-out clause for people who don’t want insurance.

“I would like to see the individual mandate repealed but I would like to see it replaced by the proposal that Sen. Cassidy and I advanced some time ago, where you have auto-enrollment with the opportunity for individuals to opt out if they wish to do so,” she said.

Collins said she had not heard about the so-called "skinny" ObamaCare repeal plan until a reporter asked about it.

“I would look forward to hearing more details about that at lunch,” she said, ahead of a Senate Republican meeting to discuss healthcare strategy.

Collins has been a tough vote for Republican leaders to win throughout the process.

She is seen as a likely “no” vote in Tuesday’s procedural motion that would effectively begin a floor debate on ObamaCare repeal.