Trump's failures began years ago when Bolton became Trump's national security adviser in 2018, he quickly moved to disband the White House National Security Council's Directorate for Global Health Security and Biodefense, which President Barack Obama set up after the 2014-2016 Ebola outbreak to lead federal coordination and preparation for disease outbreaks. In April 2018, Bolton fired Tom Bossert, then the homeland security adviser, who, the Washington Post reported, "had called for a comprehensive biodefense strategy against pandemics and biological attacks." Then, that May, Bolton the head of pandemic response, Rear Adm. Timothy Ziemer, and his global health security team. The team, the Directorate for Global Health Security and Biodefense, was never replaced.
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But it's important to have this kind of agency set up before an outbreak. Setting up an agency takes time; it requires hiring staff, handing out tasks and expected workloads, creating internal policies, and so on. A preexisting agency is also going to have plans worked out before an outbreak, with likely contingencies in place for what to do. That's why it was so important to have this agency in place even during years, like 2018, when disease pandemics didn't seem like a nearby threat to everyone.
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Trump, for his part, has defended his record, arguing, "I'm a businessperson. I don't like having thousands of people around when you don't need them. When we need them, we can get them back very quickly."
But experts argue that's not how pandemic preparedness should work. "You build a fire department ahead of time," Tom Inglesby, director of the Johns Hopkins Center for Health Security, told the Washington Post. "You don't wait for a fire."