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 WhitehouseDems introduce bill requiring disclosure of guest logs from White House, Trump properties Sanders announces first staff hires in Iowa, New Hampshire McConnell works to freeze support for Dem campaign finance effort MORE (R.I.) and Barbara BoxerBarbara Levy BoxerHispanic civil rights icon endorses Harris for president California AG Becerra included in Bloomberg 50 list Climate debate comes full circle 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 ReidSuicide is not just a veteran problem; it is an American problem The Hill's Morning Report — Washington readies for Mueller end game Bernie campaign 2.0 - he's in it to win it, this time around 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 McConnellTrump: Green New Deal 'the most preposterous thing' and 'easy to beat' 2020 Dems avoid this year's AIPAC conference GOP eager to exploit Dem court-packing fight 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 InhofeThe Hill's Morning Report - Dems look to rebuild 'blue wall' Funding caps, border wall set stage for defense budget battle Trump's claims of defeating ISIS roil Congress 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 HaganNC state senator meets with DSCC as Dems eye challenge to Tillis GOP, Dems locked in fight over North Carolina fraud probe 2020 Dems compete for top campaign operatives MORE (N.C.), Mary LandrieuMary Loretta LandrieuDems wrestle over how to vote on ‘Green New Deal’ Lobbying world Former New Orleans mayor: It's not my 'intention' to run for president MORE (La.), Mark BegichMark Peter BegichFormer GOP chairman Royce joins lobbying shop Lobbying world Dem governors on 2020: Opposing Trump not enough 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.