Elizabeth Warren
Sen. Elizabeth Warren says Hillary Clinton is running on "the most progressive agenda" in history. Reuters

Massachusetts Sen. Elizabeth Warren has a message for any progressive Democrats who have still not gotten over Bernie Sanders. During an interview with MSNBC’s Chuck Todd Wednesday, Warren said Clinton is running on "the most progressive agenda" in history.

Warren defended the former secretary of state's opposition to the Trans-Pacific Partnership, something GOP nominee Donald Trump called into question during the first presidential debate on Monday night. "She was quite explicit once the TPP came out that this is not the deal, and she has said that she will block it if she is president of the United States," Warren said. "There's no ambiguity here. She has been absolutely explicit about it, and we've got it — you got it on tape, you got it on video multiple, multiple times."

Trump accused Clinton during the debate of only opposing the TPP in response to his popular criticism of the trade deal, implying she would flip-flop again on the issue if elected. Trump has been running on a promise to back the U.S. out of trade deals like the TPP, which he believes have caused manufacturing jobs to flee the United States for cheaper labor in other countries. He also attacked Clinton for President Bill Clinton's signing of NAFTA.

"Now you want to approve the Trans-Pacific Partnership," Trump said. "You were totally in favor of it. Then you heard what I was saying, how bad it is, and you said, 'I can't win that debate.' But you know that if you did win, you would approve that."

"Well, Donald," Clinton responded, "I know you live in your own reality, but that is not the facts."

Trump's accusations are centered around a comment Clinton made while serving as secretary of state in 2012 saying the TPP would be the "gold standard" in trade deals. While Clinton admits she said that, she argues that when the deal was finally fully negotiated in 2015, she did not agree with the final terms as it pertained to protections for American workers.

Many have accused Clinton of only switching her position to court working class voters for the election. Obama still supports the agreement, as does Clinton's running mate, Virginia Sen. Tim Kaine.

The Trans-Pacific Partnership is a controversial trade agreement concerning a group of 12 countries bordering the Pacific Ocean. The deal hopes to reduce barriers to trade, including the elimination of certain tariffs among the participating countries, as well as setting standards for the ways the countries deal with each other economically. It includes stricter labor and environmental rules, legal protections for drug companies and increased copyright protection.

Warren, who has a record of skepticism when it comes to the TPP, had Clinton's back Wednesday.

"Trump is good at fulminating. He's good at waving his hands and raising his voice, but he has no fundamental idea. He just kind of does this magic. Oh, well I'm going to negotiate a better deal," Warren said. "Better deal how? What exactly is your idea, Donald Trump, for trying to do better trade for the United States? There's just no there there with him."