The GAO tests revealed potential weaknesses in the nation’s newest social program. However, in the real world, it may be difficult for fraudsters to profit, since government subsidies are paid directly to insurance companies.

Still, Ways and Means Chairman Dave Camp, a Michigan Republican, said the health law is rife with “incompetence, waste and the potential for fraud.”

House Republicans have voted some 50 times to repeal or scale back Obama’s top domestic accomplishment, the sweeping health care overhaul that is currently providing coverage to an estimated 15 million people, through a combination of subsidized private insurance and expanded Medicaid.