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WASHINGTON (CBSMiami/AP) — Senator Elizabeth Warren says she is “troubled” by reports that former president Barack Obama is getting paid $400,000 to speak at a health care conference put on by a Wall Street firm.

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The Massachusetts Democrat said Thursday on SiriusXM’s “Alter Family Politics” program that she is concerned about the overall influence of money in politics.

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Obama spokesman Eric Schultz says in a statement that the Democratic former president accepted the invitation to speak at the September event because health care is “an issue of great importance to him.” He added that Obama implemented financial reforms even after taking money from Wall Street as a candidate in 2008.

Schultz says Obama will be true to his values and record “regardless of venue or sponsor” for his speeches.

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(© Copyright 2017 CBS Broadcasting Inc. All Rights Reserved. The Associated Press contributed to this report.)