A new health insurance option from the Trump administration could help Obamacare achieve the influx of customers that has long escaped it and also lay the groundwork for either a conservative or a liberal overhaul to the system.

Under the rule, released in June, employers have the option of forgoing coverage for their workers in favor of giving them a pot of tax-free money known as health reimbursement arrangements, or HRAs, that they can use to buy their own health insurance. The provision appeals to conservatives because it allows patients to have more choice and gets closer to the goal of disentangling health insurance from employment.