senators john barrasso (r-wy), joe manchin (d-wv), thom tillis (r-nc), gary peters (d-mi), chuck schumer (d-ny), john boozman (r-az), ed markey (d-ma), mike crapo (r-id), catherine cortez masto (d-nv), joni ernst (r-ia), jon tester (d-mt), jim inhofe (r-ok), tom udall (d-nm), john cornyn (r-tx), doug jones (d-al), john thune (r-nd), kirsten gillibrand (d-ny), jerry moran (r-ks), mazie hirono (d-hi), mike rounds (r-sc), todd young (r-in), shelley moore capito (r-wv), and kevin cramer (r-nd) all signed the letter. 