"We need these documents to identify any possible weaknesses in FDA's regulatory system that can be immediately corrected administratively or legislatively," said the letter, dated November 16 and addressed to FDA Commissioner Margaret Hamburg by four Republicans, including committee chairman Fred Upton.
"This committee has a long history of thoroughly and deliberatively investigating problems and offering solutions. We cannot and will not be in a position to do so in this case until we have a full accounting," the letter said.
FDA officials had no immediate comment.
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