Illinois will join the World Health Organization's Global Outbreak Alert and Response Network (GOARN) following the United States' departure from the UN health agency last month, Governor JB Pritzker, a Democrat, said on Tuesday. The move makes Illinois the second U.S. state to join the program in defiance of Republican President Donald Trump after California, also led by a Democratic governor, joined in January. The U.S. formally left the WHO last month after completing a one-year waiting period following an executive order that Trump signed on his first day back in office in January 2025.