Nearly two-thirds of Americans want Congress to ensure that residents in every state can receive insurance subsidies though the Affordable Care Act, according to a new national poll conducted as the Supreme Court prepares to decide a legal challenge that could strip away the subsidies in more than 30 states.

Asked whether lawmakers should pass a law “so that people in all states can be eligible for financial help,” just one-quarter of those surveyed said no, according to the poll by the nonprofit Kaiser Family Foundation.