At issue in House v. Burwell is whether the administration has been illegally paying cost-sharing reduction subsidies to insurers. This issue was also the subject of a Republican House investigation, which resulted in a recent report concluding that the administration knowingly made the payments without a congressional appropriation, which is illegal.

In May, district court judge Rosemary Collyer sided with the House, deeming the payments illegal. The administration is appealing. If it is unsuccessful, it will be a serious blow to already struggling Obamacare exchanges.

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