The SNAP reform proposed by the Republicans could jeopardize the Senate tax bill due to a violation of the Byrd rule.

The Byrd Rule, adopted in 1985, is a procedural constraint named after the late Senator Robert C. Byrd of West Virginia to prohibit “extraneous” provisions from being tacked onto reconciliation bills, which are fast-tracked budget packages that allow legislation to pass with a simple majority, bypassing the 60-vote filibuster threshold.

The Senate parliamentarian has advised that a Republican proposal that would shift some food stamp costs from the federal government to the states would violate the chamber’s strict rules