Financier George Soros argued in a letter to the editor of the Financial Times that CEO Mark Zuckerberg and CFO Sheryl Sandberg should be "removed from control" of Facebook FB, -0.89% . "Facebook does not need to wait for government regulations to stop accepting any political advertising in 2020 until after the elections on November 4. If there is any doubt whether an ad is political, it should err on the side of caution and refuse to publish. It is unlikely that Facebook will follow this course," he wrote. Zuckerberg controls a majority of Facebook's voting shares.