Former Democratic presidential candidate Sen. Bernie Sanders (I-Vt.) criticized former President Barack Obama during an interview Friday on "CBS This Morning" for allegedly agreeing to a massive payday for an upcoming Wall Street speech. According to reports, Obama has agreed to speak for $400,000 at a Wall Street health care conference in September, hosted by Cantor Fitzgerald LP.

Sanders, a vocal critic of Wall Street, often criticized former Democratic presidential nominee Hillary Clinton for delivering such speeches during the contentious 2016 Democratic primary.

The senator labeled Obama’s decision “unfortunate.”

"President Obama's a friend of mine," Sanders said. "I think he, as president, represented our country with integrity and intelligence, but 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.

"I would have hoped that the president would not have given a speech like this," Sanders said.

Host Gayle King asked Sanders if he would deliver a Wall Street speech if he were offered $400,000.

"If Wall Street offered me that, yeah, I don't want Wall Street's money. But I must tell you, I really don't have to worry about that too much," Sanders said as the program’s hosts laughed. "I haven't gotten too many invitations from Wall Street."

Sen. Elizabeth Warren (D-Mass.), another Wall Street critic, also chastised Obama’s decision during in a Thursday interview on the "Alter Family Politics" program on Sirius XM.

"I was troubled by that," she said.