Supreme Court Health Care Decision Coming Thursday

The Supreme Court did not rule on the constitutionality of President Obama's health care law Monday, pushing the announcement of the decision to Thursday morning.

The decision is among the most closely watched in decades. As a political matter, the case tests Obama's signature achievement as president, the Affordable Care Act.

The ruling could also impact millions of Americans' access to health insurance, which the law expanded through Medicaid, the future creation of health care exchanges for private insurance and the provision allowing adult children to remain on their parents' plans until age 26.

The Court could deal with the law in any number of ways. It could invalidate or sustain the law as a whole, or strike down provisions -- such as the individual mandate to purchase health insurance -- and leave most of the rest of the law in place. It could also punt on ruling on the law at all, or void the Medicaid expansion.

The court heard three days of argument in March over the case.