Sources said the probe into the congressman has ramped up in recent weeks. Investigators have started interviewing more women who were allegedly introduced to Gaetz through Greenberg, who last month pleaded guilty to sex trafficking a 17-year-old girl -- who later went on to work in pornography -- and introducing her to other "adult men." Since May, a new round of target letters and subpoenas in the wide-ranging investigation have been sent out, ABC News has learned. Another avenue investigators have been focusing on recently, according to sources, are contracts that Greenberg handed out through the tax office totaling more than $1.5 million, which an independent audit late last year described as "unnecessary" and "considered to be a waste of taxpayer dollars," according to documents in the forensic audit of the tax office obtained by ABC News through a public records request. Sources told ABC News that investigators have reached out to Keith Ingersoll, whose firm KI Consulting had a $48,000 contract with the tax office that ran between January 2017 and September 2020. The audit found that there was "no evidence of work product" by Ingersoll's group despite the multi-year contract and staff at the tax office being "unaware what this group did."