The action isn't technically considered a filibuster, since no actual legislation is up for debate.
Jeanne Shaheen, D-N.H., and Mark Udall, D-Colo., are exceptions, and both have recently attended fundraisers sponsored by billionaire Thomas Steyer, whose NextGen Political Action group has refused to spend any of its pledged $100 million on Democrats who oppose climate regulation.
Democratic aides have provided the following list of senators planning to speak:
Senator Sheldon Whitehouse, D-R.I.
Senator Barbara Boxer, D-Calif.
Senator Dianne Feinstein, D-Calif.
Senator Ron Wyden, D-Ore.
Senator Bill Nelson, D-Fla.
Senator Maria Cantwell, D-Wash.
Senator Benjamin L. Cardin, D-Md.
Senator Bernard Sanders, I-Vt.
Senator Amy Klobuchar, D-Minn.
Senator Mark Udall, D-Colo.
Senator Tom Udall, D-N.M.
Senator Jeanne Shaheen, D-N.H.
Senator Jeff Merkley, D-Ore.
Senator Kirsten Gillibrand, D-N.Y.
Senator Al Franken, D-Minn.
Senator Richard Blumenthal, D-Conn.
Senator Chris Murphy, D-Conn.
Senator Martin Heinrich, D-N.M.
Senator Angus King, I-Maine
Senator Tim Kaine, D-Va.
Senator Elizabeth Warren, D-Mass.
Senator Edward J. Markey, D-Mass.
Senator Cory Booker, D-N.J.