Republican Sen. Susan Collins Susan Margaret CollinsThe Hill's Campaign Report: Biden asks if public can trust vaccine from Trump ahead of Election Day | Oklahoma health officials raised red flags before Trump rally Gideon leads Collins by 12 points in Maine Senate race: poll Senate leaders quash talk of rank-and-file COVID-19 deal MORE (Maine) said Friday that lawmakers should, at the very least, release a framework of their plan to replace ObamaCare before repealing the law.

"I think we need a detailed framework that tells the American people, including those who depend on the Affordable Care Act for their coverage, and the insurance industry ... what direction we're headed," Collins told The Hill.

She said that in an "ideal situation" lawmakers would repeal and replace ObamaCare simultaneously, but, "absent that," they should release an outline instead of repealing and then making a replacement plan later.

Collins is one of a growing number of Senate Republicans who are voicing concerns about nixing the healthcare law without a replacement plan.

Both the House and Senate are expected to vote next week to lay the groundwork for repealing the law, with committees having until late January to hash out their repeal bills.

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In addition to Collins, GOP Sens. Bob Corker Robert (Bob) Phillips CorkerHas Congress captured Russia policy? Tennessee primary battle turns nasty for Republicans Cheney clashes with Trump MORE (Tenn.), Rand Paul Randal (Rand) Howard PaulGOP senator to quarantine after coronavirus exposure The Hill's Morning Report - Sponsored by National Industries for the Blind - Trump seeks to flip 'Rage' narrative; Dems block COVID-19 bill Overnight Health Care: Senate Democrats block GOP relief bill | Democrats reveal Medicaid chief's spending on high-paid consultants | Trump calls question about why he 'lied' about COVID-19 a 'disgrace' MORE (Ky.) and Tom Cotton Tom Bryant CottonLoeffler calls for hearing in wake of Netflix's 'Cuties' Health care in the crosshairs with new Trump Supreme Court list Cruz says he wouldn't accept Supreme Court nomination MORE (Ark.) have each signaled this week that they believe ObamaCare repeal and a replacement plan should be moved together. Paul also met with members of the House Freedom Caucus this week.

"To me it is problematic if we have a transition period but wait until the end of the transition period to unveil a replacement, because it won't give the markets time to adjust and it raises questions about what happens in the meantime," Collins added Friday.

Senate GOP leadership has backed voting to repeal ObamaCare immediately but including an "off ramp" that would delay the repeal, though GOP leaders haven't locked down an exact timeline. Asked about the details of a replacement plan during a weekly press conference, Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellSenate Republicans signal openness to working with Biden Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll The Hill's Campaign Report: Biden asks if public can trust vaccine from Trump ahead of Election Day | Oklahoma health officials raised red flags before Trump rally MORE (R-Ky.) signaled lawmakers were focused on first repealing the law.

Collins has also raised concerns over linking a fight to defund Planned Parenthood to the repeal bill, saying she "is not happy" about House Speaker Paul Ryan Paul Davis RyanAt indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates Peterson faces fight of his career in deep-red Minnesota district MORE's (R-Wis.) plan.

Republicans have 52 seats in the Senate and will need 50 senators to support repealing the bill. No Democrat has said they will support repeal, instead warning that Republicans will face political backlash if they move forward without a replacement plan.