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Manchin's speech came just ahead of a Senate vote on the resolution. The resolution, authored by Sen. James InhofeJames Inhofe House passes water bill with Flint aid, drought relief Fight over water bill heats up in Senate Trump taps Oklahoma attorney general to lead EPA MORE (R-Okla.), would remove new EPA standards to reduce mercury and other toxic emissions from coal power plants.

"I thank my colleague Sen. Inhofe for introducing this important resolution to send a resolution to the EPA," Manchin said.

Manchin said the EPA had "truly gone too far" with the resolution.

"From the day I arrived in the Senate I've been determined to stop the EPA's job-killing agenda and this resolution of disapproval takes an important step to reign in this out-of-control agency," Manchin said.

Manchin's comments stand in strong conflict with other Democrats', including from fellow West Virginia Sen. Jay RockefellerJay RockefellerLobbying world Overnight Tech: Senators place holds on FCC commissioner Overnight Tech: Senate panel to vote on Dem FCC commissioner MORE, who made a floor speech and issued a statement earlier in the day expressing strong opposition to the resolution.

"I don’t support this Resolution of Disapproval because it does nothing to embrace coal’s potential," Rockefeller said. "It moves us backward, not forward.  And unless this industry aggressively leans into the future, coal miners will lose the most."

Because of Democratic opposition, Inhofe's resolution will likely fail even though it can't be filibustered. 

—This story was updated at 11:42 a.m.