California Gov. Gavin Newsom Gavin Newsom Newsom signs law allowing transgender inmates to be placed in prison by their gender identity OVERNIGHT ENERGY: California seeks to sell only electric cars by 2035 | EPA threatens to close New York City office after Trump threats to 'anarchist' cities | House energy package sparks criticism from left and right California seeks to sell only electric cars by 2035 MORE (D), a winery owner himself, defended “wine caves” after Sen. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.) and other Democratic presidential candidates attacked them during Thursday's debates.

Warren's critiques focused on South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBillionaire who donated to Trump in 2016 donates to Biden The Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice MORE's fundraiser. The two are battling ahead of the Iowa caucuses.

“It’s my business. It’s how I started,” Newsom told HuffPost after the onstage clash between the candidates.

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Newsom built a large-scale enterprise that includes wineries and a San Francisco wine shop, which was placed into a blind trust when he was elected governor in 2018, the outlet noted.

Newsom added that he owned a wine cave himself and touted California’s wine industry.

“It’s a point of pride. It’s one of America’s great exports,” the Democratic governor said. “I don’t know that it’s helpful to have those kinds of debates.”

The wine caves have became a point of contention among White House contenders because of the debate over money in politics.

Warren took a swipe at traditional high-dollar political fundraising, referencing a closed-door fundraiser for Buttigieg held “in a wine cave full of crystals and served $900-a-bottle wine.”

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“We made the decision many years ago that rich people in smoke-filled rooms would not pick the next president of the United States,” she said. “Billionaires in wine caves should not pick the president of the United States.”

The fundraiser was held in a Napa Valley wine cave that features a chandelier with 1,500 Swarvoski crystals, HuffPost noted. It was hosted by former U.S. Ambassador to Austria Kathryn Hall, the wealthy co-owner of the winery. Hall was appointed by former President Clinton after being a prolific donor to the Democratic Party.

Buttigieg fired back by noting that he was the only candidate on the debate stage who was neither a millionaire nor a billionaire. He also noted that Warren raised money from wealthy donors for her Senate campaign, which was transferred to her presidential campaign account earlier this year.

“Senator, your presidential campaign right now as we speak is funded in part by money you transferred having raised it at those exact same big ticket fundraisers you denounce,” he said, addressing Warren. “Did it corrupt you, senator? Of course not.”

A website called peteswinecave.com surfaced shortly after the debate but it leads to to the Democratic fundraising platform ActBlue and options for donating to Sen. Bernie Sanders Bernie SandersTrump, Biden will not shake hands at first debate due to COVID-19 Sanders tells Maher 'there will be a number of plans' to remove Trump if he loses Sirota reacts to report of harassment, doxing by Harris supporters MORE (I-Vt.).