Mitt Romney on Friday slammed President Obama over his pledge that consumers who liked their health insurance plans could keep them under Obamacare, saying that “broken promise” could undermine the president's second term.

“I think a lot of people recognize the flaws in the Obamacare product, not just its implementation but the more fundamental flaw which was the president promised people could keep their plans. That promise was not accurate, it was not honest, and the whole foundation of his second term, I think, is in jeopardy as a result of that,” said Romney, the 2012 GOP presidential nominee, in an interview on “CBS This Morning.”

The White House has compared the troubled rollout of Obamacare to the implementation of the Massachusetts health care reforms which Romney signed as governor. Romney though dismissed any comparisons.

“The real problem with the President’s plan is not just the rollout. That’s implementation and glitches of various kinds. It should have been done better but it wasn’t,” he said. “The real problem that the President has is the broken promise, is dishonesty. That’s, of course, what’s really striking at the heart of his term.”

Obama repeatedly promised that consumers could keep their plans if they liked them but millions of Americans are likely to be dropped from insurance plans which do not meet Obamacare’s new requirements.

The controversy, coupled with the technical issues marring the website threaten to undercut support for Obama's signature domestic achievement and hurt Democrats in the run up to the 2014 midterms.

Obama on Thursday announced an administrative fix which would allow insurers to reinstate those cancelled plans through 2014. Insurance industry leaders though criticized the fix, saying it would be difficult to implement.

The president has also rejected GOP suggestions that he intentionally misled the public about the health care law.

Asked if Obama had lied when promising that people could keep their plans, Romney said the president “understood” what would happen and had been “dishonest.”

“I think the President understood. It’s now quite well documented. That’s his administration. He understood a lot of people would lose their insurance,” said Romney. “That was in the nature of the entire product that they put forward. They knew that and yet said, “Well, you can keep your insurance, period.“

“It’s just dishonest,” he added. “What starts twisted, stays twisted.”