Updated

The chairman of the House Energy and Commerce Committee told Fox News’ Greta Van Susteren Wednesday that the committee is “very concerned” about the security of HealthCare.gov, as the website continues to be plagued by glitches.

Rep. Fred Upton, R-Mich., said on “On the Record” the committee did not get all the answers it wanted from Health and Human Services Secretary Kathleen Sebelius when she testified before them Wednesday on the botched rollout of the ObamaCare sign-up website.

“I’ll tell you, one of the things we’re very concerned about is the security of information that individuals post on that website, knowing that in fact they’re changing the lines or changing some of the information that’s out there literally every single day,” Upton said.

“And unless they do an end-to-end testing, it’s not necessarily secure, which is why some of the news networks in fact reported earlier this week that it’s pretty easy for a hacker to try and get that information.”

Upton also says the committee plans to ask Sebelius back to testify again in December to continue to press her on the law.

“She’s going to tell us what those sign-up numbers are, that is for sure,” Upton said.