Sen. Bernie SandersBernie SandersTop Sanders adviser: Warren isn't competing for 'same pool of voters' Eight Democratic presidential hopefuls to appear in CNN climate town hall Top aide Jeff Weaver lays out Sanders's path to victory MORE (I-Vt.) is disappointed with former President Barack ObamaBarack Hussein Obama3 real problems Republicans need to address to win in 2020 Obama's high school basketball jersey sells for 0,000 at auction Dirty little wars and the law: Did Osama bin Laden win? MORE's $400,000 speech to a leading investment firm, calling it "unfortunate" that the Democratic leader would ally himself with Wall Street interests.

"I think at a time when people are so frustrated with the power of Wall Street and the big-money interests, I think it is unfortunate that President Obama is doing this," Sanders said on CBS's "This Morning."

"Wall Street has incredible power, and I would have hoped that the president would not have given a speech like this," he added.

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Sanders' comments echoed those of another vocal opponent of income inequality, Sen. Elizabeth WarrenElizabeth Ann WarrenTop Sanders adviser: Warren isn't competing for 'same pool of voters' Eight Democratic presidential hopefuls to appear in CNN climate town hall In shift, top CEOs say shareholder value not top goal MORE (D-Mass.), who on Thursday said that she was "troubled" by the speaking fee the former president is reportedly receiving. 

The New York Times on Wednesday reported that Obama would receive the equivalent of his annual salary as president to speak at Cantor Fitzgerald LP's healthcare conference in September. No official announcement has been made yet. 

Still, the news has opened the former president up to criticism in recent days. But a spokesman for Obama rejected the idea that Wall Street would sway Obama, pointing to the financial reforms implemented during his time in office.

"With regard to this or any speech involving Wall Street sponsors, I'd just point out that in 2008, Barack Obama raised more money from Wall Street than any candidate in history — and still went on to successfully pass and implement the toughest reforms on Wall Street since [former President Franklin Delano Roosevelt]," Eric Schultz said in a statement.