A Republican representative told his fellow party members Monday that they are committing political suicide by threatening to cut Medicaid. Missouri Senator Josh Hawley wrote a New York Times op-ed Monday warning other Republicans that the Trump administration’s pursuit to axe support for the lower class is “both morally wrong and politically suicidal.

A preliminary estimate from the nonpartisan Congressional Budget Office said the proposals would reduce the number of people with health care by 8.6 million over the decade.

The Republican senator from Missouri called potentially deep cuts in the program “morally wrong” and “politically suicidal” for his party as it courts working-class voters.