Vermont Sen. Bernie Sanders said Hillary Clinton will not change her mind on opposing a controversial trade deal signed this year.

Sanders was asked during a Wednesday news conference about the chances of Clinton, the Democratic nominee for president, reversing course and officially supporting the Trans-Pacific Partnership (TPP).

"I don't believe that," Sanders said flatly.

ABC News posted a brief clip of Sanders' comment on Twitter.

Sanders was Clinton's rival in the Democratic race for president. He fell short of earning the nomination and endorsed Clinton in July.

After eight years of negotiations, President Barack Obama used fast-track powers earlier this year to enter the U.S. into the deal that involves 11 other countries that border the Pacific Ocean.

The TPP has divided both major political parties, with Democrats and Republicans both opposed to it. Clinton supported the deal during her days as secretary of state under Obama, but she changed her mind last year.

Republican presidential nominee Donald Trump is against the TPP, but his running mate, Indiana Gov. Mike Pence, has pledged his support of it.