(FOX NEWS) — Cost estimates for a key part of President Obama’s health care overhaul law have ballooned by $111 billion from last year’s budget, and a senior Republican lawmaker on Friday demanded an explanation.

House Ways and Means Committee Chairman Dave Camp, R-Mich., wants to know by Monday why the estimated ten-year cost of helping millions of middle-class Americans buy health insurance has jumped by about 30 percent.

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