In a thread on Twitter, Altman said he was "voting against Trump because I believe the principles he stands for represent an unacceptable threat to America."
He also said Peter Thiel, who was still working with YC at the time, "is a high profile supporter of Trump," and that, "I disagree with this."
But, he said, "YC is not going to fire someone for supporting a major party nominee."
YC and Thiel stopped working together a year later in 2017 for unspecified reasons.
During his interviews, Altman said he "did not expect to talk to so many Muslims, Mexicans, Black people, and women in the course of this project."
He said almost everyone he approached was willing to talk to him, but they also didn't want to share their names in fear of being "targeted by those people in Silicon Valley if they knew I voted for him." Altman said one of the people he talked to in Silicon Valley made him sign a confidentiality agreement before talking because she was scared of losing her job for supporting Trump.
Source: Twitter, Sam Altman, Insider