Top Republicans on Capitol Hill’s health committees are asking the Obama administration to lower payment rates for insurers who benefit from a controversial “reinsurance” program in the Affordable Care Act.

House Energy and Commerce Chairman Fred Upton (R-Mich.), Senate Health, Education, Labor and Pensions Chairman Lamar Alexander (R-Tenn.) and House Education and Workforce Chairman John Kline (R-Minn.) sent the Centers for Medicare and Medicaid Services a letter Tuesday, obtained by Morning Consult, calling for reduced reimbursement and to allow certain plans to not participate.