Rep. Ron Kind (D-WI) introduced the Tribal Tax and Investment Reform Act of 2016 (H.R. 4943), which would, among other things, establish a tax-exempt bond volume cap for Indian tribal governments, similar to the volume caps for state governments. The tax-exempt bond volume cap would be based on the total national tribal population and allocated to individual tribes by the Secretary of the Treasury. H.R. 4943 would also repeal the essential government function requirement. H.R. 4943 has been referred to both the House Ways and Means Committee and the House Education and the Workforce Committee.
H.R. 4943 is available here.