Former senior adviser to President Obama David Axelrod defended Obama's claim that if Americans liked their health care plan they could keep it.

Obama's popular phrase used to sell the Affordable Care Act is now being challenged as millions of Americans are receiving cancellation notices on their insurance policies.

"The fact of the matter is, the president went out and said, I think he said what he believed to be the fact and what was substantially was the fact, because 90, whatever, 95, 96, 97 percent of Americans are in the position where they can keep the insurance they have and they're going to see no changes," Axelrod explained to MSNBC's Chris Hayes on Monday night.

Axelrod dismissed people currently losing their health plans as a "small group" of people who bought "substandard policies" in the individual market.

Axelrod also blasted Mitt Romney for his comments on "Meet the Press" on Sunday, accusing Obama of lying to the American people about their health care.

"The campaign's a year old," Axelrod said. "Get over it."