Trump’s announcement that the U.S. will withhold all its contributions to the World Health Organization (WHO) is an unforgivable abnegation of U.S. responsibility at the very moment when a coordinated international public health response is most needed.

At the height of a pandemic that threatens to kill millions and capsize the global economy, the U.S. president is trying to deflect blame for his own failings by going on a public offensive against the world’s preeminent public health organization. In consequence, the ability of the world’s most powerful countries to coordinate an effective global response to the pandemic has been dramatically…