Former Maryland Gov. Martin O'Malley went directly after former Secretary of State Hillary Clinton Monday over her repeated flip-flops on a number of hot-button issues in the 2016 race.

In an interview with "Morning Joe," O'Malley said Clinton has "changed her position on virtually every defining issue" in the 2016 contest, pointing specifically to her stance on the Trans-Pacific Partnership.

"I am clear about my principles. I know where I stand," O'Malley said, adding that he has been against TPP for eight months. Clinton, by contrast, came out against the trade bill in early October.

"Hillary Clinton has changed her position on virtually every defining issue in this race, except for one — and that is to protect the big banks on Wall Street and go along with business as usual," the 2016 hopeful said. "I don't believe that's what the people of our country are looking for."

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