Earlier this week, a panel monitoring Nasa said the agency had failed to meet three of 15 recommendations made by the Columbia Accident Investigation Board for the safe resumption of shuttle flights.
Republican senators targeted the Independent Payment Advisory Board, an expert panel created under the new law to recommend changes to Medicare coverage.
共和党的参议员把靶子打向了IPAB，一个被用来在新的法律条款下提出建议改变医疗费率的专家小组。
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"I'm not going to get up on a panel and sit in front of a board or something like that," he says. "But if I'm asked the question, I will definitely answer it."