Here's a running list of the most high-profile American billionaires and multi-millionaires who have asked the government to raise their taxes

"I need to pay higher taxes," Gates said in a 2018 interview with CNN's Fareed Zakaria. "I've paid more taxes, over $10 billion, than anyone else, but the government should require people in my position to pay significantly higher taxes."

Gates hasn't expressed support for a specific tax proposal, unlike many of the other ultra-wealthy Americans on this list, however.

"The wealthy are definitely undertaxed relative to the general population," Buffett said on CNBC's "Squawk Box" in February.

Buffett has suggested that Congress expand income tax credits for low-income Americans, raising taxes on high earners in the process, CNBC reported.

Schultz built a $3.8 billion fortune running the coffee chain, Business Insider previously reported. While Schultz left Starbucks in 2018, he still owns more than 37.7 million shares — or roughly 3% — of the company's stock.

In the 60 Minutes segment, Dalio said he thinks the American dream is lost and referred to the wealth gap as a "national emergency."

Dalio, 70, founded his hedge fund, Bridgewater Associates, in his apartment in 1975, Business Insider previously reported. It now has $150 billion in assets under management. Dalio has a net worth of $18.7 billion, Forbes estimates.

The granddaughter of The Walt Disney Company cofounder Roy Disney has made a name for herself as one of the company's most outspoken critics. The 59-year-old heiress has criticized the salary of Disney CEO Bob Iger and defended Meryl Streep after she called Walt Disney a "bigot," according to CNN Business.

Disney has a net worth of $120 million, she said in July. "The internet says I have half a billion dollars and I might have something close to that if I'd been investing aggressively," Disney told the Financial Times.

Disney was one of 18 ultra-wealthy Americas to sign an open letter in June asking presidential candidates to support a moderate wealth tax. The letter isn't the first time that Disney has spoken out about tax reform. Disney criticized the 2017 Republican tax bill in a NowThis video, saying the bill unfairly benefited the wealthy.

In 2015, Forbes estimated that the Gund family had a net worth of $3.4 billion and ranked them among the 100 wealthiest families in America.

Agnes Gund, 81, used the fortune she inherited from her father, the president of an Ohio-based bank, to become a noted philanthropist in arts and social justice, according to The New York Times. Agnes Gund received the National Medal of the Arts in 1997 from President Bill Clinton for her work, which included serving as the president of the Museum of Modern Art in New York.

Catherine Gund, 54, is an Emmy award-winning film director and producer. Gund founded non-profit production studio Aubin Pictures in 1996, according to her biography on the studio's website.

Hughes, 35, is a cofounder of Facebook. He left the social network in 2007 to become the online organizer for Barack Obama's first presidential campaign. Despite calling for Facebook to be broken up in May, Hughes has a stake in the company worth $850 million, Newsweek reports.

In 2016, Forbes put Hughes' net worth at $430 million.

Eldridge, 32, is a political activist and former congressional candidate in New York, according to Vanity Fair. Eldridge was born in Canada.

"This is really a conservative position about increasing the stability of the economy in the long term and having an efficient source of taxation," Simmons told the Associated Press in October.

Simmons, 44, serves as the cofounder and principal of impact investing firm Blue Haven Initiative alongside his wife and fellow signatory Liesel Pritzker Simmons, according to the firm's website. Simmons is the heir to a family fortune that stems from the construction of locks on the Erie Canal, according to Forbes.

Pritzker Simmons, an heiress to the Pritzker family fortune, has a net worth of approximately $600 million, according to a 2013 Forbes article. Simmons, now 35, is also a cofounder and principal of Blue Haven Initiative.

As a child, she starred in several big-name Hollywood productions, including "A Little Princess" and "Air Force One," alongside Harrison Ford. In 2002, Forbes reports, she sued her father and the Pritzker family and came away from it with a $500 million payout.

"Charitable giving by itself simply cannot provide enough money to support public goods and services, such as public education, roads and bridges, clean air," Bowditch told the Associated Press in October. "It has to be done by taxes."

Bowditch, 80, has previously advocated for raising taxes on the wealthy: In 2010, he signed an open letter to President Obama asking him to allow tax cuts for millionaires to expire, according to a CBS affiliate in Boston.

According to his personal website, Alexander Soros, 34, serves as deputy chair of the Open Society Foundations, a nonprofit founded by his father.

"I am in favor of taxing the rich," George Soros, 89, told The Times' Andrew Ross Sorkin in October, "including a wealth tax. A financier makes people suspicious ... and it does create a moral problem for me. As I became so successful, it basically put a self-imposed constraint on me that actually interfered with making money."

The philanthropist made his fortune running Quantum Fund, which was once the largest hedge fund in the world. Soros has a net worth of $8.3 billion, Business Insider previously reported.

"A wealth tax would not just be fair, it would be pro-growth," Hanauer wrote in an essay advocating for a wealth tax published in Business Insider. "And don't let the trickle-downers tell you otherwise."

Hanauer, 60, was an early investor in Amazon, according to his personal website. Business Insider previously reported that Hanauer is a longtime critic of America's income inequality.

Business Insider's Rich Feloni previously reported that Hanauer has said he's not a billionaire, but that, as both he and his wife have signed The Giving Pledge, their combined net worth at least approaches the $1 billion threshold.

"It's just too much to watch that happen at the top and see what is happening at the bottom," Munger told the Associated Press in October. "Isn't it a waste when beautiful homes on the beach are empty for most of the summer?"

Munger, 71, is the oldest daughter of Berkshire Hathaway vice chairman Charlie Munger. Munger is a Harvard Law graduate who works as a civil rights attorney in Pasadena, California, according to the Los Angeles Times. In 2012, she advocated for a tax hike in California to boost funding for the state's public schools.

Broad doesn't believe that his philanthropic work and other policies including a $15 minimum wage, expanding access to health care, and reforming public education are doing enough to help low-income Americans, he wrote in The New York Times.

"It's time to start talking seriously about a wealth tax," Broad wrote in The Times. "I simply believe it's time for those of us with great wealth to commit to reducing income inequality, starting with the demand to be taxed at a higher rate than everyone else."

Broad built a $6.8 billion fortune after cofounding home builder Kaufman & Broad, according to Forbes.

"Local efforts — like the tax I supported last year on San Francisco's largest companies to address our city's urgent homelessness crisis — will help," Benioff wrote in The New York Times on October 14. "Nationally, increasing taxes on high-income individuals like myself would help generate the trillions of dollars that we desperately need to improve education and health care and fight climate change."

Benioff built a $6.5 billion fortune after founding software developer Salesforce. Benioff currently serves as the company's co-CEO.