WASHINGTON (AP) — President Barack Obama argues that his signature health care law is already benefiting most Americans even if they don't know it.

The president says despite what he calls "sky is falling" predictions, the Affordable Care Act's provisions are already in place for those with health insurance.

He says what's left is to help those Americans who don't have health care coverage to obtain it. He acknowledged that is "a big undertaking" and predicted there could still be some glitches as the details are worked out.

Obama was speaking at a news conference Tuesday at the White House.