"How wrong can this be that basically what's happening here is that people work in Washington, and man, they hit that revolving door with a speed that would blind you," Warren said in a Wednesday interview with Katie Couric of Yahoo! News.
Cantor will serve as a vice chairman, managing director and board member at the bank.
Warren claimed in the interview that people like Cantor "head straight out into the industry, not because they bring great expertise and insight, but because they're selling access back in to their former colleagues who are still writing policy, who are still making laws."
"I just think this is fundamentally the wrong approach, and I think it's -- it worries me about what happens if people in government are looking for that next job ... that ultimately infects whatever it is that they're doing, and I just think this is wrong," Warren said.
Couric and Warren discussed a wide range of topics in the interview, including the minimum wage, the threat posed by the Islamic State, Israeli settlement activity, the situation in Ferguson, Missouri and the speculation over Warren's 2016 plans.