Senate Environment and Public Works Committee member Sen. Bernard Sanders, I-Vt. speaks on Capitol Hill in Washington, Wednesday, Jan. 18, 2017, during the confirmation hearing for Human Services Secretary-designate, Rep. Tom Price, R-Ga. (AP Photo/Carolyn Kaster)
Sen. James Inhofe, R-Okla., chairman of the Senate Environment and Public Works Committee, speaks to reporters on Capitol Hill in Washington. in this 2014 file photo. (AP Photo/Susan Walsh) **FILE**
Senate Environment and Public Works Committee Chairman Sen. Barbara Boxer, D-Calif., left, checks her phone during a meeting of the Senate Climate Action Task Force prior to taking to the Senate Floor all night to urge action on climate change on Monday, March 10, 2014, in Washington. From left, Boxer, Sen. Chuck Schumer, D-N.Y., Sen. Jeanne Shaheen, D-N.H., and Sen. Maria Cantwell, D-Wash. (AP Photo/ Evan Vucci)
Senate Environment and Public Works Committee Chairman Sen. Barbara Boxer, D-Calif., talks with Senators during a meeting of the Senate Climate Action Task Force prior to taking to the Senate Floor all night to urge action on climate change on Monday, March 10, 2014, in Washington, from left, Sen. Patrick Leahy, D, Vt., Sen. Ed Markey, D-Mass., Richard Blumenthal, D- Conn., Sen. Chuck Schumer, D-N.Y., and Sen. Maria Cantwell, D-Wash. (AP Photo/ Evan Vucci)
Senate Environment and Public Works Committee Chairman Sen. Barbara Boxer, D-Calif., talks with Sen. Sheldon Whitehouse, D-R.I., during a meeting of the Senate Climate Action Task Force prior to taking to the Senate Floor all night to urge action on climate change on Monday, March 10, 2014, in Washington. At left is Sen. Jeanne Shaheen, D-N.H. (AP Photo/ Evan Vucci)
**FILE** President and Chief Executive Officer of the U.S. Chamber of Commerce Thomas J. Donohue, left, listens as AFL-CIO President Richard L. Trumka, right, testifies before the Senate Environment and Public Works Committee hearing on transportation infrastructure Capitol Hill in Washington, Wednesday, Feb. 12, 2014. (AP Photo/Susan Walsh) **FILE**