A national policy director for Sen. Bernie Sanders Bernie SandersSirota reacts to report of harassment, doxing by Harris supporters Republicans not immune to the malady that hobbled Democrats The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election MORE’s (I-Vt.) 2020 campaign predicted that health care and climate change will be among the top issues raised during Wednesday's Democratic presidential primary debate.

“Obviously, health care is going to be near or at the top of the list,” Josh Orton said Tuesday during an appearance on “Rising.”

“I also think that one of the things we’re seeing more and more young people engage with — and you saw this with some of the Sunrise Movement that he and [Rep. Alexandria] Ocasio-Cortez talk to in Iowa — is global climate change and how are we actually going to address this existential crisis,” he added.

Orton emphasized that Sanders has long been an advocate for addressing climate change, noting that Sanders in 2016 named global climate change as the biggest threat to national security.

“We see the science and if we’re to believe the scientists that we don’t have a lot of time left, we really have to create a comprehensive program to address climate change, so I really hope that climate change is at the top of the list,” he told Hill.TV.

In August, the Vermont senator rolled out a $16 trillion climate change plan to address climate change. The comprehensive plan calls for transitioning to 100 percent renewable energy and making sure that the U.S. economy is carbon-free by 2050.

But it is Sanders's signature "Medicare for All" plan that has garnered the most attention. The proposal looks to effectively get rid of a single-payer option in favor of a government-run plan.

Orton defended the progressive policy during his interview with Hill.TV.

"From the beginning, I think Bernie has always said that this is not going to be easy," he told Hill.TV. "And I think that's one of the things that people admire about him is that he knows that this is a big fight."

Sanders along with nine other candidates are poised to face off in the fifth Democratic debate in Atlanta.

Former Vice President will take center stage alongside top rivals Sanders and Sen. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.). The frontrunners will be flanked by Sen. Cory Booker Cory Anthony BookerThe movement to reform animal agriculture has reached a tipping point Watchdog confirms State Dept. canceled award for journalist who criticized Trump 3 reasons why Biden is misreading the politics of court packing MORE (D-N.J.), Amy Klobuchar Amy Klobuchar3 reasons why Biden is misreading the politics of court packing Social media platforms put muscle into National Voter Registration Day Battle lines drawn on precedent in Supreme Court fight MORE (D-Minn.), South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBillionaire who donated to Trump in 2016 donates to Biden The Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice MORE, Sen. Kamala Harris Kamala HarrisTexas Democratic official urges Biden to visit state: 'I thought he had his own plane' The Hill's Campaign Report: Biden on Trump: 'He'll leave' l GOP laywers brush off Trump's election remarks l Obama's endorsements A game theorist's advice to President Trump on filling the Supreme Court seat MORE (D-Calif.), businessman Andrew Yang Andrew YangBiden's latest small business outreach is just ... awful Doctor who allegedly assaulted Evelyn Yang arrested on federal charges The Hill's Campaign Report: Biden weighs in on police shootings | Who's moderating the debates | Trump trails in post-convention polls MORE and billionaire Tom Steyer Tom SteyerTV ads favored Biden 2-1 in past month Inslee calls Biden climate plan 'perfect for the moment' OVERNIGHT ENERGY: Trump administration finalizes plan to open up Alaska wildlife refuge to drilling | California finalizes fuel efficiency deal with five automakers, undercutting Trump | Democrats use vulnerable GOP senators to get rare win on environment MORE.

The debate will also feature an all-female panel of moderators, including MSNBC's Rachel Maddow Rachel Anne MaddowGOP lawmakers distance themselves from Trump comments on transfer of power Schiff urges Trump administration members to resign: 'You cannot maintain your silence' Michael Cohen: Trump hates Obama because he's everything he 'wants to be' MORE and Andrea Mitchell as well as NBC News’ Kristen Welker and Ashley Parker.

—Tess Bonn