Sen. Elizabeth Warren (D-Mass.), who is running for the 2020 Democratic presidential nomination, sharply rebuked former Vice President Joe Biden for holding "swanky private fundraisers" after he launched his presidential campaign.

But according to the Philadelphia Inquirer, Warren is guilty of the exact same sin.

What are the details?

After Biden's campaign announced his campaign launch fundraising haul of $6.4 million, Warren blasted Biden in an email to campaign supporters.

"How did Joe Biden raise so much money in one day? Well, it helps that he hosted a swanky private fundraiser for wealthy donors at the home of the guy who runs Comcast's lobbying shop," the April 26 email said.

Comcast Senior Executive Vice President David Cohen and Daniel Hilferty, CEO of health insurance company Independence Blue Cross, reportedly attended Biden's fundraiser last month.

But now Warren's attacks are being exposed as hypocritical. That's because she hosted a Philadelphia fundraiser last March where she met with many of the same donors who attended Biden's fundraiser last month.

What's worse, according to the Inquirer, two men who organized Biden's fundraiser — former Pennsylvania Gov. Ed Rendell (D) and lawyer Stephen Cozen — were also listed as organizers for Warren's Senate re-election fundraising event. Warren sought donations of up to $5,400.

What was reaction to Warren's attacks?

Lawyer Kenneth Jarin, who also served as host for Biden, called Warren's attacks "preposterous."

"I was pleased to support Sen. Warren, I think she's a terrific senator, but I think it makes no sense for her to criticize Biden for taking checks at the maximum allowed," he told the Inquirer. "I know that she took lots and lots of $2,700 checks raising money for her Senate campaigns."

However, Daniel Berger, managing shareholder at Berger Montague, somewhat defended Warren's criticisms, despite donating $2,800 to Biden's campaign.

"At the Biden event, there were people who genuinely support Joe, like I do, for idealistic reasons, and then there were corporate people who were giving money because they have an interest," Berger told the Inquirer. "There were no such people at the event that I hosted for Warren. These were people who genuinely agree with her on her positions and policy issues."

Berger told the newspaper that he is ideologically attuned more with Warren, but believes Biden stands the best chance at defeating President Donald Trump in November 2020.