Hillary Clinton’s technology company tapped a Connecticut-based firm to back up copies of her personal and work-related emails shortly after she left the State Department, creating confusion among the contractors she had already hired to manage her existing server.

In a letter Monday to Datto Inc., the Norwalk, Conn., technology firm that transferred her emails to cloud-based storage, Sen. Ron Johnson revealed employees at the company primarily responsible for managing Clinton’s emails, Platte River Networks, were concerned about getting swept up in what appeared to be “some shady [sic] s—.”