Alan Li, who was fired from Mount Sinai and arrested on May 12, was charged with attempted sex trafficking of a minor under 14 and attempted coercion or enticement of a minor.

An investigation of the 26-year-old began on March 12 after a woman from Ohio, an escort whom Li met through a dating site, contacted federal agents to report Li’s search for underage girls in Miami.

Li contacted the woman through Snapchat and said he was trying to help a friend named Michael Chen, whom he put in contact with her due to her own experience of being trafficked. When he was asked the age range of the girls he was looking for, Li said “ideally 8-15,” according to the affidavit.

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The woman told investigators that she believed Li and Chen to be the same person, which agents later confirmed to be true. An undercover agent took over the woman’s Snapchat account to communicate with the man.

Li was given a phone number for an investigator posing as a trafficker. He reportedly discussed a “long-term set up” similar to the “live-in situation” he claimed to have previously had with a 13-year-old girl. Li asked if he could pay the $500 fee for sex with a 12-year-old with Bitcoin or cash rather than over CashApp.

Read more: Next Shark