Sen. Bernie Sanders Bernie SandersMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Why Democrats must confront extreme left wing incitement to violence MORE (I-Vt.) said during Friday night's presidential debate in New Hampshire that the state's two Democratic senators — Maggie Hassan Margaret (Maggie) HassanCongress needs to prioritize government digital service delivery Senate Democrats demand answers on migrant child trafficking during pandemic Hillicon Valley: Feds warn hackers targeting critical infrastructure | Twitter exploring subscription service | Bill would give DHS cyber agency subpoena power MORE and Jeanne Shaheen Cynthia (Jeanne) Jeanne ShaheenSenate Democrats introduce bill to sanction Russians over Taliban bounties Trump-backed candidate wins NH GOP Senate primary to take on Shaheen Democratic senator urges Trump to respond to Russian aggression MORE — were wrong to vote for President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE's new trade agreement with Canada and Mexico.

"Yes," Sanders said when asked directly if Hassan and Shaheen were incorrect in voting for the deal. "I mean, it's a disagreement."

"There is not one word in that trade agreement that deals with climate change, and I don't know how in 2020 you could do that," Sanders said.

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He went on to argue that the agreement, known as the United States-Mexico-Canada Agreement (USMCA), would lead to continued outsourcing of American jobs to Mexico.

Sen. Amy Klobuchar Amy KlobucharEPA delivers win for ethanol industry angered by waivers to refiners It's time for newspapers to stop endorsing presidential candidates Biden marks anniversary of the Violence Against Women Act, knocks Trump and McConnell MORE (D-Minn.), who voted for the USMCA, said she wanted to "defend the honor of the incredible two senators from New Hampshire."

She said there were "major improvements" in the trade agreement pertaining to labor inspections.

Klobuchar said she would work to make sure that climate change provisions are included in future trade deals and that the best ways to tackle the issue are to reenter the Paris climate agreement, restore former President Obama's clean power rules and put a price on carbon. She argued that having no trade agreement with Canada and Mexico would put the U.S. at a disadvantage when trying to "pushing China to do better when it comes to climate change."

Sen. Elizabeth Warren Elizabeth WarrenWarren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon No new taxes for the ultra rich — fix bad tax policy instead MORE (D-Mass.) also explained her vote in favor of Trump's North American trade deal, saying Democrats helped to improve the agreement and that it "makes things somewhat better for workers and for farmers."

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"When I see a law that makes things somewhat better for hardworking people in this country, I say, 'I'll sign up for that.' And then I'll get up tomorrow morning and I'll start working hard for a better trade deal on climate," Warren said.

Another candidate, 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, said he agreed with Sanders on the USMCA.

"Everybody wants to get into our market, and that's how we convince them that they've got to be right on climate too," Steyer said.