FILE: U.S. Department of Health & Human Services (HHS) Secretary Kathleen Sebelius testifies before a House Education and the Workforce Committee hearing on Capitol Hill in Washington, June 4, 2013. (REUTERS/Jim Bourg) FILE: U.S. Department of Health & Human Services (HHS) Secretary Kathleen Sebelius testifies before a House Education and the Workforce Committee hearing on Capitol Hill in Washington, June 4, 2013. (REUTERS/Jim Bourg)

Health and Human Services Secretary Kathleen Sebelius will testify before the Energy and Commerce Committee on Oct. 30 about implementation of the Affordable Care Act, the panel announced Monday night, while the two top federal contractors will appear Thursday.

House Republicans had been pressuring Sebelius to appear at a hearing on the health-care law, also known as Obamacare, on Thursday. But she was scheduled to be in Phoenix, and has agreed to come next week instead. The two top contractors involved in the HealthCare.gov Web site, CGI and QSSI, as well as Serco and Equifax, have confirmed they will appear at Thursday's hearing.

“We are now entering week four of the botched health care rollout, and with hundreds of millions of taxpayer dollars spent for a system that still does not work, Congress and the American people deserve answers," said the panel's chairman Fred Upton (R-Mich.) in a statement. "And as the administration continues to withhold important details and enrollment figures, I hope Secretary Sebelius is ready to give answers and finally live up to the president’s celebrated claims of transparency.”