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 WhitehouseDemocrats won’t let Kavanaugh debate die Senate poised to confirm Kavanaugh after bitter fight Hillary Clinton bursts out laughing about Kavanaugh's 'revenge on behalf of the Clintons' remark MORE (R.I.) and Barbara BoxerBarbara Levy BoxerFormer Dem aide makes first court appearance on charges of posting GOP senators' info online Ex-House intern charged with 'doxing' GOP senators during Kavanaugh hearing Capitol Police arrest suspect in doxing of GOP senators 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 ReidSenate heads home to campaign after deal on Trump nominees GOP has always been aggressive in trying to weaponize the system of judicial nominations Republicans come full circle with Supreme Court battle to the end 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 McConnellGOP Senate candidate: Kavanaugh 'debacle' 'hugely motivating' to Missouri voters Trump praises McConnell: He ‘stared down the angry left-wing mob’ to get Kavanaugh confirmed Murkowski not worried about a Palin challenge 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 InhofeGraham: 'Game changer' if Saudis behind journalist's disappearance GOP senators ask EPA to block states that have 'hijacked' rule to stop fossil fuel production Pentagon releases report on sexual assault risk 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 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 (N.C.), Mary LandrieuMary Loretta LandrieuLobbying world Former New Orleans mayor: It's not my 'intention' to run for president Dems grasp for way to stop Trump's Supreme Court pick MORE (La.), Mark BegichMark Peter BegichRepublicans see silver linings in deep-blue states Election Countdown: Trump plans ambitious travel schedule for midterms | Republicans blast strategy for keeping House | Poll shows Menendez race tightening | Cook Report shifts Duncan Hunter's seat after indictment The Hill's Morning Report — Trump’s legal jeopardy mounts after Manafort, Cohen felony counts 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.