Kathleen Sebelius Resigns from HHS

Health and Human Services Secretary Kathleen Sebelius is resigning from her position following a problematic roll-out of President Barack Obama's signature health-care law.

Sign-ups for Obamacare closed just over a week ago, but the initial opening weeks of the enrollment period were littered with problems, leaving many Americans unable to sign up for health care insurance.

The website was eventually fixed, however, and 7.1 million people signed up for health care by the March 31 deadline, a number exceeding initial expectations.

According to White House sources, Obama accepted Sebelius' resignation this week and will nominate Office of Management and Budget Director Sylvia Mathews Burwell to replace Sebelius.