White House hopeful Bernie Sanders is raising “extremely serious concerns” about how the Democratic National Committee and Hillary Clinton’s presidential campaign are spending the millions they’ve raised through the loophole mechanism known as a “joint fundraising committee.”

In a letter (pdf) sent Monday to Democratic National Committee (DNC) chair Debbie Wasserman Schultz, Sanders campaign attorney Brad Deutsch details “serious apparent violations” of campaign finance laws on the part of the national party apparatus, Clinton’s campaign, and their joint fundraising committee (JFC): the Hillary Victory Fund.

Specifically, the letter accuses the Fund of using “extremely large-dollar individual contributions” to pay for direct mail and online advertising, “both of which appear to benefit only” the Clinton campaign.

“While the use of joint fundraising agreements has existed for some time,” said Jeff Weaver, Sanders’ campaign manager, “it is unprecedented for the DNC to allow a joint committee to be exploited to the benefit of one candidate in the midst of a contested nominating contest.”

Weaver further elaborated on MSNBC on Monday:

As the Center for Responsive Politics (CRP) explained on its blog last week, “JFCs allow star fundraisers to spread their wealth around the party. The donors can’t get around individual contribution limits—but they can get creative.” According to the Center, no more than $2,700 of a donor’s gift, per election, can go to any specific candidate, no more than $33,400 per year to a national party committee, and no more than $10,000 per year to any state party. 

However, as CRP and a number of news outlets have noted, loosened campaign finance rules have made it easier to get around strict limits.

Citing the U.S. Supreme Court’s 2014 McCutcheon v. FEC decision, CRP wrote in February:

Maine’s Pine Tree Watchdog and Alaska Dispatch News have both reported on such arrangements between their respective state parties, the Hillary Victory Fund, and the DNC.

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Indeed, the Washington Post reported earlier this year, “Even as it has bolstered the DNC, the Hillary Victory Fund has had striking success bringing in new donors to support Clinton’s fight to beat Sanders for the Democratic nomination. The committee spent more than $4 million prospecting for small-dollar contributors through direct mail and online ads that resemble official campaign material, down to the signature ‘I’m with her’ tagline. The net proceeds raised for the campaign: $3.24 million through the end of 2015.”

While legal experts are divided on whether Sanders’ claims have merit, a closer look at JFC contributions sheds light on the fundamental divergence between the Vermont senator’s and Clinton’s fundraising bases.

As the Center for Responsive Politics wrote on Friday:

“The Clinton campaign is bending campaign finance rules to their breaking point all so Wall Street fat cats and people like Alice Walton can contribute 130 times the legal limit to support her campaign. All to defeat us in the primary,” Weaver wrote in an email to supporters distributed soon after the letter to Schultz was released.

“So, this is distressing, but it’s probably to be expected,” he said. “The Clinton campaign has raised the majority of its money from people giving the maximum amount of money under the law and her super PACs have raised more than $15 million from Wall Street alone.”