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The flubbed HealthCare.gov rollout has been deeply embarrassing for the administration.
White House spokesman Eric Schultz told Reuters the "cherry-picked" emails did not reveal anything new.
"To the extent that CMS had identified capacity issues, we of course sought assurances that they were getting addressed," he said. "But, as is well known, nobody anticipated the severity of the problems we experienced once the site launched."
In a statement, a CMS spokeswoman said the agency previously admitted it underestimated the volume of users who would try to log onto the system at the same time, according to Reuters.
"It is important to remember that these emails are one piece of a number of ongoing discussions up to the launch of HealthCare.gov on October 1," the statement said.
In a press release on the committee's website, the House panel chairman slammed the Obama administration’s decision to launch the website amid the technical problems outlined in the emails.
Energy and Commerce Committee Chairman Fred Upton, R-Mich., stated, "The administration rolled the dice, and Americans are left to struggle with the broken website and the president's broken promises. The frenzied lead-up to Oct. 1, coupled with the inadequate testing and numerous systems failures, reveal an administration that was not up to the job despite over three years to prepare.”
Obama has said that he was unaware of the glitches the site faced and that he would not have launched it if he had been aware of the extent of its technical problems.
Another document disclosed by the committee on Tuesday, however, showed that Obama was alerted as early as March that the website had not undergone enough end-to-end testing and that the program's "significant dependency" on contractors was problematic.
As a result of the website's technical problems, on Oct. 22 Obama pushed back the deadline for uninsured Americans to sign up for health insurance or else face a fine, from Feb. 15 to March 31 .
The Obama administration revealed on Nov. 13 that fewer than 27,000 people had signed up for private health insurance last month in the 36 states relying on the federal website.
States running their own enrollment systems — including California, which has had over 35,000 people enroll — fared better, signing up more than 79,000 from Oct. 1 through Nov. 2, according to the Department of Health and Human Services.
The administration has promised that the problems with HealthCare.gov will be ironed out by the end of November. Though the website is still plagued by IT difficulties, a CMS spokeswoman told reporters Monday that 90 percent of users who had had trouble with the website succeeded in creating an account on their second attempt.