115th Congress (2017-2018) 117th | 116th | 114th | 113th | 112th | 111th Co-Chair Inhofe, James M. (R-OK) Co-Chair Menendez, Robert (D-NJ) Republican 16 Members Boozman, JohnR-ARCotton, TomR-ARIsakson, JohnnyR-GAGrassley, ChuckR-IAMoran, JerryR-KSCassidy, BillR-LAVitter, DavidR-LACollins, Susan M.R-MEWicker, Roger F.R-MSBurr, RichardR-NCLankford, JamesR-OKGraham, LindseyR-SCScott, TimR-SCRounds, MikeR-SDJohn CornynR-TX Democrat 10 Members Durbin, Richard J. D-ILMarkey, Edward J. D-MAPeters, Gary C. D-MITester, Jon D-MTHeitkamp, HeidiD-NDSchumer, Charles E. D-NYBrown, Sherrod D-OHWyden, Ron D-ORManchin, Joe, III D-WV