In his June 2015 decision disposing of King v. Burwell, the last lawsuit before the presenting pending one seeking to cripple the Affordable Care Act, Chief Justice Roberts summarily disposed of the plaintiffs' patently fraudulent argument about Congressional intent.
The suit was based on a drafting error. While the law envisioned states forming their own health insurance exchanges, but gave them the option of deferring to a federal exchange, key provisions referred only to "an exchange established by a state" as the vehicle for allocating premium subsidies to enrollees. The error was a biproduct of the political warfare that affected the ACA's drafting history, preventing an ordinary reconciliation of Senate and House versions.
Recognizing that spotlighting a drafting error would not suffice to convince the courts to cripple the ACA marketplace, the plaintiffs argued that the omission was no error. They claimed that while Congress intended to authorize state-based health insurance exchanges to grant premium subsidies to qualifying enrollees, Congress intended not to authorize the federal exchange to grant those subsidies. (At the time the suit came before the Supreme Court, 37 states were relying on the federal exchange, HealthCare.gov.) Testimony by those involved in the law's creation was unanimous that no one intended to bar the federal exchange from awarding premium subsidies.
Writing for a 6-3 majority, Roberts' disposed of the intent question thusly:
Congress passed the Affordable Care Act to improve health insurance markets, not to destroy them.