The Better Business Bureau is warning consumers that phone calls purportedly from Hillary Clinton are actually scammers looking to prey on gullible supporters.

The BBB described the scam in an alert:

You answer the phone, and it’s a recording of former President Barack Obama or former Secretary of State Hillary Clinton. In the message, which is likely lifted from a speech, the politician asks for a donation. Then, another voice prompts you to push a button and speak with an agent, who will collect your credit card information.

“Speaking to the ‘donation agent’ can give scammers information they may use in later cons,” the BBB warns.

While these calls may be phony, Clinton supporters have complained about her campaign scamming them out of money in the past.

The Observer reported in September:

Hillary Clinton’s campaign is stealing from her poorest supporters by purposefully and repeatedly overcharging them after they make what’s supposed to be a one-time small donation through her official campaign website, multiple sources tell the Observer.

The overcharges are occurring so often that the fraud department at one of the nation’s biggest banks receives up to 100 phone calls a day from Clinton’s small donors asking for refunds for unauthorized charges to their bankcards made by Clinton’s campaign. One elderly Clinton donor, who has been a victim of this fraud scheme, has filed a complaint with her state’s attorney general and a representative from the office told her that they had forwarded her case to the Federal Election Commission.

“We get up to a hundred calls a day from Hillary’s low-income supporters complaining about multiple unauthorized charges,” an anonymous source, from the Wells Fargo fraud department told the Observer.

HILLARY IS A WHORE! Exclusive: Clinton Campaign Systematically Overcharging Poorest Donors https://t.co/maphnjO4AK pic.twitter.com/I9tLhoXpIQ — Lucio Castignano (@luciocastignano) September 15, 2016

“We don’t investigate fraudulent charges unless they are over $100,” the fraud specialist told the paper.

“The Clinton campaign knows this, that’s why we don’t see any charges over the $100 amount, they’ll stop the charges just below $100. We’ll see her campaign overcharge donors by $20, $40 or $60 but never more than $100.”