Democratic presidential candidate Sen. Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE (I-Vt.) vowed to “immediately” renegotiate a North American trade deal that he called an “absolute disaster” should he be elected president in 2020.

Sanders issued his statement Wednesday, shortly after President Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE signed the deal that Sanders has repeatedly criticized.

"As the only leading presidential candidate to oppose Trump’s NAFTA 2.0, I am pledging today that upon being sworn in as president, I will immediately begin renegotiating this disastrous deal to combat climate change, stop the outsourcing of American jobs and end the destructive race to the bottom,” Sanders said in a statement, referring to the North American Free Trade Agreement, which the new trade deal replaced.

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Sanders was one of 10 senators, and the only Democratic presidential candidate, to vote against the U.S.-Mexico-Canada Agreement (USMCA). He cited a lack of protection for American workers and the environment as reasons for his opposition.

“It does not even mention the words 'climate change', the most existential threat facing our planet,” Sanders added in his Wednesday statement. "We need a trade policy that works for the working class and improves the environment. And that's exactly what I will fight for as president."

Sanders’s opposition to the bill is one of his key differences between himself and fellow progressive Sen. Elizabeth Warren Elizabeth WarrenGOP set to release controversial Biden report Biden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt MORE (D-Mass.), another top competitor in the presidential primary. Warren had initially opposed the plan, but later announced support for the renegotiated version that she said made “improvements” to Trump’s original proposal.