The Congressional Republicans who brought us the mindless budget cuts known as the sequester have shown remarkable indifference to life-sustaining government services, American jobs and other programs. So what do they make of the country’s commitments to American Indians, its longstanding obligations to tribal governments under the Constitution and treaties dating back centuries?

Very little, it seems. The sequester will impose cuts of 5 percent across the Indian Health Service, the modestly financed agency within the United States Department of Health and Human Services that provides basic health care to two million American Indians and native Alaskans. It is underfinanced for its mission and cannot tolerate more deprivation.

Here lies a little-noticed example of moral abdication. The biggest federal health and safety-net programs — Social Security, Medicaid, the Children’s Health Insurance Program, the Supplemental Nutrition Assistance Program, Supplemental Security Income, and veterans’ compensation and health benefits — are all exempt from sequestration. But the Indian Health Service is not.

The agency was supposed to be spared the worst of the automatic cuts; at least that is what its officials believed. Under a 1985 law that served as the model for the current sequester, annual cuts to appropriations for the Indian Health Service could not exceed 2 percent.