Presidential candidate Andrew Yang had a fundraiser attended by tech workers in San Francisco at supporter and tech investor Sam Altman's house. Altman and Yang talked about their shared interest in "universal basic income" and the argument against breaking up big tech. Yang called the proposal espoused by Elizabeth Warren and Bernie Sanders "a knee-jerk 20th-century approach to much more nuanced problems." The former tech executive running in the 2020 election has supporters in Silicon Valley, where employees from Google, Apple, and Facebook have donated large sums to his campaign. Visit Business Insider's homepage for more stories.