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 HaganPolitics is purple in North Carolina Democrats can win North Carolina just like Jimmy Carter did in 1976 North Carolina will be a big battleground state in 2020 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 CollinsOvernight Tech: Judge blocks AT&T request for DOJ communications | Facebook VP apologizes for tweets about Mueller probe | Tech wants Treasury to fight EU tax proposal Overnight Regulation: Trump to take steps to ban bump stocks | Trump eases rules on insurance sold outside of ObamaCare | FCC to officially rescind net neutrality Thursday | Obama EPA chief: Reg rollback won't stand FCC to officially rescind net neutrality rules on Thursday 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.