A 55 percent majority of Americans view the Republican-backed American Health Care Act negatively, the same proportion who want the Senate to make major changes to the legislation or reject it, the survey finds. Only 8 percent want the legislation, which would repeal and replace the 2010 Affordable Care Act, approved as it now stands.

Almost half of the public, 49 percent, holds favorable views of the ACA, while 42 percent have negative views, which are among the law’s most positive ratings tracked in polls by the nonpartisan Kaiser Family Foundation in the years since the law’s passage.

The survey was conducted May 16-22, after the House passed its health-care bill on May 4. The results underscore the challenge facing the Senate when it returns to work next week and continues debating the House bill or crafting an alternative.

Its work was made harder by a recent Congressional Budget Office report that concluded that the House legislation would result in 23 million more uninsured people by 2026 than under the current law. The poll was before the report’s release.