WASHINGTON - The three days of Supreme Court arguments that start Monday on the constitutionality of President Obama’s health care law will be a legal marathon, and the lawyers involved have been training.
Last week, there were so many of the mock argument sessions, which lawyers call moot courts, that they threatened to exhaust something that had never been thought in short supply: Washington lawyers willing to pretend to be Supreme Court justices.
The problem, said Paul D. Clement, who represents the 26 states challenging the law, is not just the length of the arguments that the court will hear, but the variety of topics to be addressed.
The law itself is a sprawling revision of the health care system meant to provide coverage to tens of millions of previously uninsured Americans by imposing new requirements on states, employers, and insurance companies and, through what has been called the individual mandate, by requiring most Americans to obtain insurance or pay a penalty.
The central issue in the case, to be argued for two hours Tuesday, is whether the individual mandate is constitutional. But first, on Monday, the justices will hear 90 minutes of arguments from three lawyers about whether they should be hearing the case at all.
Whatever final decision the court reaches, its ruling will have enormous practical consequences for how health care is delivered in the United States. The ruling is likely to land in June, with large repercussions for both Obama and his Republican challenger just before the two parties hold their nominating conventions.
The justices have broken the case into four discrete issues, scheduling a separate session for each, for a total of six hours, the most in more than 40 years. Clement, like his principal adversary, Solicitor General Donald B. Verrilli Jr., will be arguing three times.
The debate over whether the suit should be heard involves the Anti-Injunction Act, an 1867 federal law that bars suits “for the purpose of restraining the assessment or collection of any tax.’’
The federal appeals court in Richmond, Va., and a prominent federal appeals court judge in Washington have issued opinions saying that the 1867 law means a decision in the health care case must be deferred until 2015, when Americans will first be penalized if they do not have health insurance.
But neither the Obama administration nor the parties challenging the law agree with that ruling. So the court appointed a Washington lawyer, Robert A. Long, to speak on behalf of that argument. The court makes such appointments every year or so, and the practice has been the subject of some skeptical academic commentary.
The Obama administration initially agreed that the court could not rule on challenges to the law for a few more years, but it reversed course in the appeals courts. It has since relinquished other opportunities to slow down the case and insists it wants a prompt decision.
Long was one of three lawyers who presented mock arguments in the grand ceremonial courtroom at the Supreme Court Institute at the Georgetown University Law Center. The moot court program there also helped prepare Clement, twice, as well as Michael A. Carvin, who represents private challengers to the law.
Clement and Carvin will face Verrilli on Tuesday for the main event, the argument over whether the requirement to obtain insurance was authorized by the Constitution as a regulation of interstate commerce or by the power to levy taxes. The administration says the health care law is well within the powers granted by the Constitution, while the challengers say it plainly exceeds what the federal government may do.
For Wednesday, the court has scheduled a double feature.
In the morning, the justices will hear 90 minutes of arguments about what should happen if they strike down the mandate. The federal appeals court in Atlanta, whose decision is under review, ruled that it was possible to remove just the mandate and leave the balance of the law intact.
As with the 1867 law, neither side agrees with that ruling. So here, too, the court has appointed an outside lawyer, H. Bartow Farr III, to argue the point.
Clement will contend that the entire law must fall. A colleague of Verrilli’s in the solicitor general’s office, Edwin S. Kneedler, will argue for a middle ground, saying that most of the law should stand but that two other provisions - one forbidding insurers to turn away applicants, the other barring them from taking account of preexisting conditions - are intertwined with the mandate and would have to fall along with it.
On Wednesday afternoon, the two main lawyers, Verrilli and Clement, will return to argue over whether Congress exceeded its constitutional authority in expanding the eligibility and coverage thresholds that states must adopt to remain eligible to participate in Medicaid, the federal-state program that provides health care to poor and disabled people.
There is room for only about 400 people in the courtroom, and prominent lawyers and politicians have been scrambling for tickets. The court has set aside about 60 seats for members of the public, and the line for them, including placeholders paid by the hour, started forming Friday morning.
There are two main points to the moot courts, said Gregory G. Katsas, who will argue Monday on behalf of the challengers that the court should not wait until 2015 to rule.
“One is identifying difficult and likely questions,’’ he said, “and the other is just practicing articulating the answers in the stress of something that approximates being at the podium.’’