BOSTON (CBS) – Sen. Elizabeth Warren is weighing in on former President Barack Obama’s pricey speaking fee for a Wall Street conference later this year.

Obama is set to deliver remarks at an event about health care hosted by Cantor Fitzgerald financial services firm. He’ll be receiving $400,000 for the speech.

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The senator from Massachusetts was promoting her new book on Radio Andy Thursday and asked what she thought about Obama’s plans.

“Well I was troubled by that,” Warren said. “One of the things I talk about in the book is the influence of money. I describe it as the snake that slithers through Washington.”

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Warren went on to speak more generally about the nature of money and politics.

Warren and Obama in 2011 (Photo by Mark Wilson/Getty Images)

There has been plenty of heat on social media for Obama, who had criticized the “fat cat bankers on Wall Street” during his presidency.

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An Obama adviser defended the former president’s Wall Street record and said that his speeches “will be true to his values, his vision and his record.”