Republicans say that they will take some action if the Supreme Court defends the big legal challenge to Obamacare, thus removing financial assistance for millions of people in two-thirds of the states. As the ruling approaches, it has become difficult to take the GOP’s promises seriously.

A majority of the experts look forward to rule on King v. Burwell on or near June 29 as it is the last official day of its term. If the plaintiffs win, it would cut tax credits, which residents in Florida, Texas and 32 other states are paying for health insurance obtained through Healthcare.gov, which is the federally operated marketplace.

These taxes are worth hundreds and sometimes even reach thousands of dollars a year. They are equivalent to a discount on insurance premiums; in their absence, majority of people who are getting the credits would not pay for their health insurance.

According to an estimate by the Urban Institute, the ranks of the uninsured would increase by over 8 million. The loss of so several customers is expected to compel insurance companies to increase premiums and get away from some markets, having an influence on even those customers purchasing directly from insurers rather than through Obamacare's marketplaces.

Leaders of the Republican Party have applauded the lawsuit; filing formal friend-of-the-court briefs supporting it in some cases.

Rep. Paul Ryan (R-Wis.) was one of those who made such promise back in early February, soon after he became chairman of the Ways and Means Committee. According to him, “We have to have a contingency plan,” Ryan said. We think we need to have an option, a plan, for these states that might find themselves in this difficult position”.