WASHINGTON (CBS DC) — Sen. Bernie Sanders, I-Vt., says he can defeat Hillary Clinton for the 2016 Democratic presidential nomination, and although he says he respects the former secretary of state, Sanders said it’s time a candidate took on the “corporate establishment.”

Speaking with CBS’ “Face The Nation” on Sunday, the Vermont independent said he is likely “the most progressive member of the United States Senate” and reiterated his stance against income inequality, Wall Street greed and billionaires controlling the political process in the U.S.

When asked if Clinton is vulnerable on issues and can be beaten for the Democratic nomination, Sanders said she is, and linked her to the “billionaires” dominating U.S. politics in the wake of the Citizens United Supreme Court ruling – which he vowed a push to overturn if elected.

“The answer is, yes. And the answer is, because there is, in my view, massive dissatisfaction in this country today with corporate establishment and the greed of corporate America and an incredibly unequal distribution of wealth and income which currently exists,” said Sanders.

Sanders spelled out the ways in which he and Clinton differ, although Sanders said he has known the former secretary of state for 25 years and “I respect her and I admire her.” Sanders criticized her support of the Iraq War as a senator in 2003, her embrace of massive super PAC campaign funding and her refusal to take a serious stance against climate change.

He also ridiculed the President Barack Obama-backed Trans-Pacific Partnership trade agreement, saying that it would be “disastrous” in losing the U.S. millions of jobs overseas.

“I think we are living in a very strange moment in American history. And that is the problems facing us, in terms of income and wealth inequality and the fact that real employment is 11 percent; youth unemployment, 17 percent,” said Sanders, reiterating that voters should review his consistent record as a self-described “Democratic socialist.”

“In terms of the fact that climate change is threatening the very foundations of our planet, that we need strong and bold leadership, I would ask people to take a look at the roles that I’ve been playing for the last 25 years standing up for working families and I have had a record which is taking on the billionaire class, taken on Wall Street, taken on the private insurance companies, and the drug companies,” said Sanders.

Sanders continued, “In terms of foreign policy, Hillary Clinton voted for the war in Iraq. Not only did I vote against it, I helped lead the effort against what I knew would be a disaster. In terms of climate change, I have helped lead the effort against the Keystone Pipeline. I’m not quite sure that Hillary Clinton has come out with a position on that. So those are just some of the areas where we differ.”

Sanders blasted the billionaire Koch brothers, saying the Citizens United ruling has allowed wealthy business owners to control elections.

“If elected president, I will have a litmus test in terms of my nominee to be a Supreme Court justice. And that nominee will say that we are all going to overturn this disastrous Supreme Court decision on Citizens United because that decision is undermining American democracy. I do not believe that billionaires should be able to buy politicians,” said Sanders.