Citing worries that “taxpayers will lose a significant amount of the money,” House Committee on Oversight and Government Reform officials are significantly expanding their probe of the $2 billion Obamacare loan program to fund new health insurance co-operatives to compete with established private-sector firms in 24 states.

Committee Chairman Rep. Darrell Issa, R-Calif., requested a lengthy list of documents in a March 25, 2013, letter to officials with eight of the groups starting co-ops. Together, the eight have received more than $657 million in low-interest loans that must be repaid at a future date.