So far, no one within the administration is known to have been fired for the problematic rollout. Some Republicans have focused their ire on Health and Human Services Secretary Kathleen Sebelius, though the White House says she continues to have the confidence of the president.
Sebelius is scheduled to testify about the botched rollout before the House Energy and Commerce Committee next week. Representatives from some of the contractors working on the websites were also scheduled to testify before the committee on Thursday.
Associated Press writers Ricardo Alonso-Zaldivar, Luis Alonso and Laurie Kellman contributed to this report.