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Manchin's speech came just ahead of a Senate vote on the resolution. The resolution, authored by Sen. James InhofeJames InhofeMcCain absence adds to GOP agenda’s uncertainty GOP signals infrastructure bill must wait Lobbying World 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 RockefellerOvernight Tech: Trump nominates Dem to FCC | Facebook pulls suspected baseball gunman's pages | Uber board member resigns after sexist comment Trump nominates former FCC Dem for another term Obama to preserve torture report in presidential papers 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.