Trevor Milton resigned from Nikola amid fraud allegations. REUTERS/Massimo Pinca A second woman has accused Nikola Motors founder and ex-chairman Trevor Milton of sexual assault, CNBC reported Monday. The woman accused Milton, in a formal complaint to police in Utah on Friday, of digitally penetrating her when she was 15 and he was 22, according to CNBC. Another woman, Milton's cousin, accused him of groping her breasts when she was 15 and he was 18, in a social media post last week, and explained the incident to The Wall Street Journal. Milton stepped down from Nikola earlier this month following the SEC's announcement it was investigating the company over fraud allegations. Visit Business Insider's homepage for more stories. A second woman has come forward with a sexual assault allegation against Nikola Motors founder Trevor Milton, CNBC reported on Monday.The woman's lawyer, Craig Johnson, told CNBC that the alleged assault happened in 2004 when she was 15 and Milton would have been 22, after he hired her as an office assistant for a security company he ran in St.