The House Energy and Commerce Committee Republicans can’t find most of the $200 million that the Obama administration claims it recouped from state-based health care exchanges as part of a federal grant program to help them set up shop, according to a new report obtained by Morning Consult.

Centers for Medicare and Medicaid Services Acting Administrator Andy Slavitt told the committee in December that “over $200 million” had been returned to federal coffers from the state exchanges since the grant program went into effect.

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The Obama administration could give states more power to manage the Affordable Care Act’s risk adjustment program, in a concession to critics who complained that the program unfairly penalized certain companies and threatened to destabilize the exchange system.

The new policy, which was issued late on May 6, encourages state insurance commissioners to seek “local approaches” to easing the impact of the risk adjustment process on small and high-growth health plans. That language appears to open the door to allowing states to artificially limit the amounts that companies might have to pay into the program each year.

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Sen. Bernie Sanders has proposed paying for his policies that transform large sectors of the government and the economy mainly through increased taxes on wealthy Americans. A pair of new studies published Monday suggests Sanders would not come up with enough money using this approach, and that the poor and the middle class would have to pay more than Sanders has projected in order to fund his ideas.

The studies, published jointly by the nonpartisan Tax Policy Center and the Urban Institute in Washington, concludes that Sanders’s plans are short a total of more than $18 trillion over a decade. His programs would cost the federal government about $33 trillion over that period, almost all of which would go toward Sanders’s proposed system of national health insurance. Yet the Democratic presidential candidate has put forward just $15 trillion in new taxes, the authors concluded.