As three historic days of oral argument at the U.S. Supreme Court came to a close on March 28, the fate of the landmark Affordable Care Act seemed as uncertain as ever amid sharp divisions among the justices.

The justices heard arguments over the third and fourth issues they agreed to hear stemming from numerous challenges to the health care law. In hearings Monday and Tuesday, the justices discussed whether they even have jurisdiction to rule, and then whether the so-called “individual mandate” requiring individuals to buy a minimum level of health coverage oversteps the power of Congress to regulate interstate commerce.