WASHINGTON — Defending President Barack Obama’s much-maligned health care law in Congress, Health and Human Services Secretary Kathleen Sebelius was confronted this morning with a government memo that raised security concerns about the website consumers are using to enroll.

The document, obtained by The Associated Press, shows that administration officials at the Centers for Medicare and Medicaid Services were concerned that a lack of testing posed a potentially “high” security risk for the HealthCare.gov website serving 36 states.

Security issues are a new concern for the troubled HealthCare.gov website.

“You accepted a risk on behalf of every user that put their personal financial information at risk,” Rep. Mike Rogers, R-Mich., told Sebelius at the House Energy and Commerce Committee.

Sebelius countered that the system is secure, although the site has a temporary security certificate, known in government parlance as an “authority to operate.” Sebelius said a permanent certificate will be issued once all security issues are addressed.

Earlier, the secretary said she’s responsible for the “debacle” of cascading problems that overwhelmed the government website intended to make shopping for health insurance clear and simple.

“Hold me accountable for the debacle,” Sebelius said. “I’m responsible.”

Sebelius is promising to have the problems fixed by Nov. 30, even as Republicans opposed to Obama’s health care law are calling in chorus for her resignation. She told the committee that the technical issues that led to frozen screens and error messages are being cleared up on a daily basis.