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 Web site, CGI and QSSI, as well as Serco and Equifax, have confirmed they will appear at Thursday's hearing.