President Donald Trump's decision to withdraw from the world health organization (WHO) has caused the agency to lose its largest funder, with the US projected to contribute $958 million, or nearly 15 per cent of Who's $6.5 billion budget for 2025. Who’s budget relies heavily on voluntary contributions, making it difficult to prioritize global health issues. The US is followed by major donors like the Bill & Melinda Gates foundation, Gavi, and the European Commission. The US has instructed public health officials to cease collaboration with Who.