After Obamacare architect Jonathan Gruber's controversial comments about how a lack of transparency and the stupidity of voters helped pass the health care law made national headlines last week, a damaging new email has now revealed that a top Obamacare official described last year's launch of the federal health care website as a "cruel and uncaring march" where the agency's boss wasn't open to seeking a delay despite various concerns, Fox News revealed in an exclusive report.

The email from Michelle Snyder, the then-chief technology officer at the Centers for Medicare and Medicaid Services, was revealed by her former second-in-command, Todd Park, who is scheduled to appear in front of a House Science, Space and Technology subcommittee hearing on Wednesday regarding the security and botched rollout of Healthcare.gov.

Snyder, second only to agency Administrator Marilyn Tavenner, wrote in a September 2013 email to U.S. tech official Park that Tavenner was a bitter, temper tantrum-throwing, demanding official who vowed to launch the website on time "no matter what."

"Just so you know (Tavenner) decided in January we were going no matter what," Snyder wrote, according to emails obtained by Fox News. "Hence the really cruel and uncaring march that has occurred since January when she threatened me with a demotion or forced retirement if I didn't take this on."

"Do you really think [Tavenner] has enough understanding of the risks to fight for a delay - no and hell no," Snyder told Park in September, before HealthCare.gov was officially launched.

"I appreciate you (sic) belief in the goodness of others but at this point I am too tired to pretend that there is a decision to be made - it is just how much crap my team will have to take if it isn't sufficiently successful - you haven't lived through the temper tantrums and threats of the last 9 months," she added.

Following the email release, the CMS failed to respond to an emailed request for comment from Fox News.

After the rocky rollout of HealthCare.gov, the House Science Space and Technology Committee obtained the email regarding the website's IT security and subpoenaed Park, requiring him to testify before the subcommittee on how much knowledge he had about security concerns with the website before it launched in October 2013, according to The Daily Caller.

Park, who has denied knowing much about the website at all, told the House Oversight Committee in a congressional testimony that he doesn't "actually have a really detailed knowledge base of what actually happened pre-Oct. 1. ... I am not even familiar with the development and testing regiment that happened prior to Oct. 1."

However, the emails from Park, who briefed the White House on the progress of the website, seem to indicate he had more knowledge of the website than his statements indicate. In the emails, he mentions specific teams, hardware and user targets for the website.

Additionally, the committee is also investigating how aware the White House was about problems with the website before the launch.

In the meantime, the committee will hold a hearing Wednesday about the security of the website, which has already been breached at least once in the span of a one-year operation.

The hearing is especially important because Americans are in the process of signing up for Obamacare, Committee chairman Rep. Lamar Smith told FoxNews.com in a statement.

"It's time for the White House to come clean with the American people about the security of the Obamacare website," Smith, R-Texas, said.