A group of US lawmakers has raised concerns about the business dealings of Tether's parent company, iFinex, with federal officials. In a letter to the US Treasury Department, the lawmakers allege that iFinex has engaged in "questionable and potentially illegal activities" that could pose a risk to the financial system. The lawmakers specifically cite iFinex's sponsorship of events for federal officials, as well as its donations to political campaigns. They argue that these activities could create a conflict of interest and could lead to unfair treatment for Tether and its competitors.