After a large share of USAID's work was terminated, a small cadre of development experts created Project Resource Optimization, or PRO, to identify highly cost-effective, life-saving programs that were on hold and connect them with philanthropic donors who could fill the gaps. CGD's Erin Collinson speaks with two PRO team members, Rob Rosenbaum and Caitlin Tulloch, about the origins and limits of the PRO initiative, its successes to date, and the lessons from the work that could help re-envision US foreign aid.