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 HaganLinking repatriation to job creation Former Sen. Kay Hagan in ICU after being rushed to hospital GOP senator floats retiring over gridlock MORE (D-N.C.) and Reps. Bruce BraleyBruce BraleyTrump: Ernst wanted 'more seasoning' before entertaining VP offer Criminal sentencing bill tests McConnell-Grassley relationship Trump's VP list shrinks 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 CollinsGOP senator grilled over DeVos vote during town hall GOP senator: Flynn should testify on Russia Greens launch ads against two GOP senators for Pruitt votes 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.