Senate Democrats spent more than 14 hours talking about the importance of climate change Monday night through Tuesday morning.

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Sens. Brian Schatz (Hawaii), Sheldon WhitehouseSheldon WhitehouseCommittee chairman aims for House vote on opioid bills by Memorial Day Regulators seek to remove barriers to electric grid storage Prison sentencing bill advances over Sessions objections MORE (R.I.) and Barbara BoxerBarbara Levy BoxerKamala Harris endorses Gavin Newsom for California governor Dems face hard choice for State of the Union response Billionaire Steyer to push for Dem House push MORE (Calif.) led the charge and more than 20 other Democrats participated, including members of leadership, in the Senate’s 35th all-night session.

“Climate change deniers still exist,” Senate Majority Leader Harry ReidHarry Mason ReidWATCH: There is no Trump-Russia collusion and the media should stop pushing this The demise of debate in Congress ‘North by Northwest,’ the Carter Page remake MORE (D-Nev.) said at the beginning of the talkathon at 6:30 p.m. Monday. “They exist, I’m sorry to say, in this Congress. … Climate change exists and it’s time to stop denying it.”

Schatz and Whitehouse said Congress could reduce harmful effects of climate change if the United States relied less on fossil fuels.

“Climate change it real and climate change is caused by humans and climate change is solvable and we will not stop until Congress acts,” Schatz said.

Senate Minority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellLawmakers feel pressure on guns Bipartisan group of House lawmakers urge action on Export-Import Bank nominees Curbelo Dem rival lashes out over immigration failure MORE (R-Ky.) said Democrats’ attack on fossil fuels was “cruel” to his constituents.

“Families are losing work because of government attacks on the coal industry. Communities are hurting and tonight you’re going to hear 30 hours of excuses from a group of people who think that’s OK,” McConnell said at the beginning of the evening. “Well it’s not OK. It’s cruel.”

McConnell has accused President Obama of waging a “war on coal” by ordering the Environmental Protection Agency (EPA) to regulate carbon emissions at coal power plants.

The Kentucky Republican, who is facing a difficult reelection race, also blasted billionaire environmentalist Tom Steyer, who plans to funnel a reported $10 million into crucial races that could make or break Democrats in their fight to retain the Senate majority.

Sen. James InhofeJames (Jim) Mountain InhofeOvernight Defense: First Gitmo transfer under Trump could happen 'soon' | White House says Trump has confidence in VA chief | Russia concedes 'dozens' of civilians injured in Syria clash Pentagon budget euphoria could be short-lived House passes deal to end shutdown MORE (R-Okla.), who has authored a book claiming that climate change was the “biggest hoax” ever perpetrated on mankind, said Democrats didn’t have the votes to pass major legislation that could affect climate change, such as a carbon tax, which was why the administration was implementing more regulations.

“I know they’ll enjoy staying up all night and they’ll have an audience of themselves,” Inhofe said. “It’s been virtually impossible to pass a cap and trade bill.”

Whitehouse has said he wants to make climate change a major issue in the 2014 election.

Notably, vulnerable Democrats such as Sens. 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 (N.C.), Mary LandrieuMary Loretta LandrieuProject Veritas at risk of losing fundraising license in New York, AG warns You want to recall John McCain? Good luck, it will be impossible CNN producer on new O'Keefe video: Voters are 'stupid,' Trump is 'crazy' MORE (La.), Mark BegichMark Peter BegichPerez creates advisory team for DNC transition The future of the Arctic 2016’s battle for the Senate: A shifting map MORE (Alaska) and Mark PryorMark Lunsford PryorMedicaid rollback looms for GOP senators in 2020 Cotton pitches anti-Democrat message to SC delegation Ex-Sen. Kay Hagan joins lobby firm MORE (Ark.) didn’t participate in the all-nighter.

-- This report was updated at 9:54 a.m.