"The Affordable Care Act was publicly debated over the course of 14 months, with dozens of Congressional hearings, and countless town halls, speeches, and debates," White House spokeswoman Jessica Santillo said in a statement. "The tax credits in the law that help millions of middle class Americans afford coverage were no secret, and in fact were central to the legislation. Not only do we disagree with Gruber's comments, they're simply not true."

An administration official noted that Gruber "did not work in the White House."

Don Firth