Sen. Lisa Murkowski Lisa Ann MurkowskiOVERNIGHT ENERGY: House passes sweeping clean energy bill | Pebble Mine CEO resigns over secretly recorded comments about government officials | Corporations roll out climate goals amid growing pressure to deliver The Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' Abortion stirs GOP tensions in Supreme Court fight MORE (R-Alaska), a potential key swing vote on an ObamaCare repeal-and-replace plan, isn’t sure she could support the emerging Senate Republican healthcare bill.

When asked Thursday if she had confidence she could eventually support a bill, Murkowski said she didn’t know.

“I just truly do not know, because I don’t know where it’s going,” she said.

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Murkowski wouldn’t commit when asked if she would support a seven-year phaseout of the Medicaid expansion, which some moderate GOP senators are pushing. Nor would she say whether she would support a slower phaseout or a faster one.

“My position on Medicaid expansion and my support for it hasn’t changed," Murkowski said.

The Alaska Republican has previously said she wouldn’t vote to repeal the Medicaid expansion if the Alaska state Legislature wants to keep it. And she was one of four senators who sent a letter to Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellTrump 'no longer angry' at Romney because of Supreme Court stance On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline The Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power MORE (R-Ky.) in early March saying they couldn't support a bill that didn't have protections for people in the Medicaid expansion population.

A group of moderate Republican senators led by Rob Portman Robert (Rob) Jones PortmanMcConnell locks down key GOP votes in Supreme Court fight Romney undecided on authorizing subpoenas for GOP Obama-era probes Congress needs to prioritize government digital service delivery MORE (Ohio) want to gradually phase out federal funding for Medicaid expansion over a seven-year period from 2020 to 2027. Senators such as Shelley Moore Capito Shelley Wellons Moore CapitoCongress must finish work on popular conservation bill before time runs out Second GOP senator to quarantine after exposure to coronavirus GOP senator to quarantine after coronavirus exposure MORE (W.Va.) and Dean Heller Dean Arthur HellerOn The Trail: Democrats plan to hammer Trump on Social Security, Medicare Lobbying World Democrats spend big to put Senate in play MORE (Nev.) have also recently spoken in support of the seven-year plan.

Medicaid is one of the biggest stumbling blocks on the path to repealing ObamaCare, and if moderates can support an eventual end to the Medicaid expansion, a compromise could be reached.

Senate leaders can only afford to lose two votes when they bring the legislation the floor. It’s a delicate balancing act, but if enough moderates can be convinced to support the bill, McConnell may not need conservative Republicans such as Rand Paul Randal (Rand) Howard PaulThe Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' Rand Paul says he can't judge 'guilt or innocence' in Breonna Taylor case Overnight Health Care: Health officials tell public to trust in science | Despair at CDC under Trump influence | A new vaccine phase 3 trial starts MORE (Ky.) or Mike Lee Michael (Mike) Shumway LeeBipartisan representatives demand answers on expired surveillance programs McConnell shores up GOP support for coronavirus package McConnell tries to unify GOP MORE (Utah) to help pass the measure.

Closed-door discussions about the substance of the bill have been happening almost daily since the House voted last month, but the secretive nature of the process has left many senators unsure of what’s actually being included in the package.