Former Vice President Joe Biden has lost the support of San Francisco-based attorney Tom McInerney, who happens to be one of the campaign's largest fundraisers.

According to CNBC, McInerney told the campaign on June 20th that he would no longer help Biden fundraise. He was the first fundraiser to publicly pull support for Biden after the former vice president made controversial comments about working with segregationists and suddenly flip-flopping on appealing the Hyde Amendment, which bars federal funding for most abortions. He eventually said he was against the law.

"At least there was some civility. We got things done. We didn’t agree on much of anything,” Biden said at the time. “Today, you look at the other side and you’re the enemy.”

That's when McInerney made his decision.

“I had actually let the campaign known I’d pulled back my support of Biden for now,” McInerney said.

Losing McInerney's support could be detrimental for Biden's campaign. During President Barack Obama's first election campaign in 2012, McInerney helped the campaign raise over $200,000 throughout the cycle. Plus, McInerney's public split from the campaign could compel other donors to do the same.

“I would imagine I’m not alone,” McInerney said.

Thew news of losing the San Francisco-based attorney comes as Biden's campaign spends the weekend fundraising in the Bay area. Biden has fundraisers scheduled with former Twitter executive Katie Stanton in Silicon Valley and President Barack Obama’s commissioner general of the USA Pavilion in Italy, Doug Hickey.