Senate leaders on Wednesday were putting the final touches on legislation that would reshape a big piece of the U.S. health-care system by dramatically rolling back Medicaid while providing a softer landing to Americans who stand to lose coverage gained under the Affordable Care Act.

Sen. Dean Heller (R-NV) said Thursday that he has yet to make a decision on his support for the Senate’s bill to repeal Obamacare, but he said in a statement that he has “serious concerns” about how the legislation will impact those on Medicaid.

The first Republican governor who opted to expand Medicaid has decided that Nevada will not be the first state in the nation to attempt to open the government-subsidized health care program to anyone, regardless of need.

Centene Corp, one of the largest players in the Obamacare individual insurance market, said on Tuesday it would expand into three new states in 2018, despite uncertainty over the future of the legislation under President Donald Trump's administration.

The Trump administration has made critical ObamaCare subsidy payments to insurers for the month of June but won't provide any certainty about whether they'll continue in the future.

More than half of Californians fear they or their loved ones will lose health coverage if the Affordable Care Act is repealed and replaced, a new statewide poll shows.