Sylvia Mathews Burwell

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Health and Human Services (HHS) Secretary Sylvia Mathews Burwell testifies on Capitol Hill in Washington, Wednesday, Feb. 10, 2016, before the House Ways and Means Committee hearing on the fiscal 2017 HHS budget. Burwell has ashes on her forehead, Wednesday being Ash Wednesday. (AP Photo/Alex Brandon)

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Health and Human Services Secretary Sylvia Mathews Burwell wrote a recent letter to Republican leaders defending the Obamacare subsidies. (Associated Press)

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Health and Human Services Secretary Sylvia Mathews Burwell departs a governors only luncheon after giving an address during the National Governors Association Winter Meeting in Washington on Feb. 22, 2015. (Associated Press) **FILE**

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Hoping to wrangle last-minute shoppers for the Jan. 1 deadline, Health and Human Services Secretary Sylvia Mathews Burwell met with religious leaders Friday on Capitol Hill. (Associated Press)

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President Obama and Health and Human Services Secretary Sylvia Mathews Burwell have tried to distance themselves from economist's Jon Gruber's "stupid Americans" remark. (Associated Press)

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Health and Human Services Secretary Sylvia Mathews Burwell implored the nation's doctors Thursday to help the U.S. stem the threat of Ebola and keep health care workers safe against the deadly virus. (AP Photo/J. Scott Applewhite, File)

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Health and Human Services Secretary Sylvia Mathews Burwell touted Obamacare's enrollment numbers in a speech Tuesday, saying "... we're spending our health care dollars more wisely and we're starting to receive higher quality care." (Associated Press)

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"As we plan for open enrollment in year two and continue to build a sustainable long-term system, we are committed to simplifying the experience for consumers by allowing auto-enrollment," Health and Human Services Secretary Sylvia Mathews Burwell. "We are working to streamline the process for consumers wishing to remain in their current plan." (AP Photo/J. Scott Applewhite, File)

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Sylvia Mathews Burwell, President Obama's nominee to become Health and Human Services Secretary, center, is greeted by Sen. Tom Coburn, Oklahoma Republican. Sen. Coburn described her as "competent." (Associated Press)

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Sylvia Mathews Burwell, President Barack Obama’s nominee to become secretary of Health and Human Services, appears before the Senate Finance Committee for her confirmation hearing, on Capitol Hill in Washington, Wednesday, May 14, 2014. Burwell has found favor with both Republicans and Democrats in her current role as the head of the Office of Management and Budget and would replace Kathleen Sebelius who resigned last month after presiding over the Affordable Care Act and its problematic rollout. (AP Photo/J. Scott Applewhite)