Sen. Bernie SandersBernie SandersFive takeaways from the Democratic debate Sanders, Warren exchange underscores Iowa stakes CNN’s Van Jones: Democratic debate was ‘dispiriting,’ no evidence party can defeat Trump MORE (I-Vt.) was the only candidate in Tuesday’s Democratic debate to oppose the United States-Mexico-Canada Agreement (USMCA), an update to the North American Free Trade Agreement.

“If this is passed I think it will set us back a number of years,” Sanders said of the deal, which has the backing of the AFL-CIO union. Other unions, Sanders noted, remained opposed.

Sen. Elizabeth WarrenElizabeth Ann WarrenFive takeaways from the Democratic debate Sanders, Warren exchange underscores Iowa stakes CNN’s Van Jones: Democratic debate was ‘dispiriting,’ no evidence party can defeat Trump MORE (D-Mass.) said that she would support the deal negotiated between President TrumpDonald John TrumpFive takeaways from the Democratic debate Sanders, Warren exchange underscores Iowa stakes CNN’s Van Jones: Democratic debate was ‘dispiriting,’ no evidence party can defeat Trump MORE and House Democrats because it was an improvement over the current agreement, but would continue to fight for more stringent deals.

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“We need a different approach to trade and it starts with the corruption of the giant corporations,” she said.

Former South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegFive takeaways from the Democratic debate Sanders, Warren exchange underscores Iowa stakes Warren, Buttigieg spar over health care costs MORE (D) agreed that the deal had been improved and said he would support it, as did Sen. Amy KlobucharAmy Jean KlobucharFive takeaways from the Democratic debate Sanders, Warren exchange underscores Iowa stakes Warren corrects Sanders after he seeks to correct her at debate MORE (D-Minn.).

Not everyone on the stage addressed USMCA, which passed in the House and could pass in the Senate as soon as this week, specifically.

Former Vice President Joe BidenJoe BidenFive takeaways from the Democratic debate Sanders, Warren exchange underscores Iowa stakes Democrats clash at debate over keeping US troops in Mideast MORE and businessman Tom SteyerTom Fahr SteyerFive takeaways from the Democratic debate Sanders, Warren exchange underscores Iowa stakes Sanders, Warren appear to have tense moment onstage after debate MORE both emphasized the need to focus on climate in the deal, an issue Sanders brought up as well.

“There will be no trade agreements signed in my administration without environmental standards,” said Biden.

Steyer, weighing in on a partial trade deal with China that Trump is set to sign Wednesday, said “if climate is not your No. 1 priority, you can’t sign a deal.”

Steyer has previously expressed support for USMCA.