A coalition of environmental groups is launching a $5 million push to help their Senate allies and to fight back against attacks from Americans for Prosperity, the conservative group backed by the billionaire energy moguls Charles and David Koch.

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The coalition, which includes the Sierra Club, the Environmental Defense Fund and the American Sustainable Business Council Action Fund, is airing ads touting the work Sen. Kay HaganKay Ruthven Hagan2020 Dems compete for top campaign operatives Senate GOP rejects Trump’s call to go big on gun legislation Politics is purple in North Carolina MORE (D-N.C.) and Reps. Bruce BraleyBruce Lowell BraleyOPINION | Tax reform, not Trump-McConnell feuds, will make 2018 a win for GOP Ten years later, House Dems reunite and look forward Trump: Ernst wanted 'more seasoning' before entertaining VP offer MORE (D-Iowa) and Gary Peters (D-Mich.) have done to protect the environment.

All three are in tight Senate battles and have been the targets of millions of dollars in negative ads from Americans for Prosperity.

The ad for Hagan attacks "oil industry billionaires" who "want to undermine the air safety standards that protect us," while the Michigan ad touts Peters's support for the Detroit auto bailout and for backing investments in renewable energy fuel.

The group is also airing ads supporting Sen. Susan CollinsSusan Margaret CollinsGOP moves to cut debate time for Trump nominees GOP senator: 'We were there' on immigration before talks got derailed GOP advances proposal to change Senate rules MORE (R-Maine), who is favored to win her race this fall.

"We want to thank these lawmakers for providing strong leadership that promotes clean energy and protects clean air," said Environmental Defense Fund Vice President Elizabeth Thompson in a statement.

The groups will also coordinate an 11-state field program to help turn out the vote for their candidates this fall.