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Dr. Berwick also said that upon his resignation, he forfeited all benefits from the institute except his supplemental executive retirement plan, which his government financial-disclosure form estimates to be worth $ 1 million to $2.35 million.

But he said he couldn’t provide Mr. Grassley with requested information about the identity of the institute’s donors.

“I remain committed to doing whatever I can to comply with your request and any other request from the committee for information related to my nomination,” he wrote. “However, because the information you requested includes non-public documents in the possession of my now former employer, it is not within my power to comply with your entire request.”