Senator Chris Murphy on Wednesday spoke at a press conference with Amazon Teamsters, as well as U.S. Senators Elizabeth Warren and Richard Blumenthal, to announce a new effort calling out Amazon for its mistreatment of drivers in the company’s Delivery Service Partner (DSP) program. In a bipartisan letter to Amazon CEO Andy Jassy, Murphy and 29 senators requested information about the DSP program and Amazon’s justification for refusing to bargain with union representatives of DSP employees and requiring DPSs to sign non-poaching agreements.