Dr. Anthony Fauci , the infectious disease expert who advised the federal government on its response to the COVID-19 pandemic, detailed his whiplash-inducing relationship with Donald Trump in his new memoir.

Excerpts from the book, On Call: A Doctors Journey in Public Service, were shared Thursday by several media outlets the week before its scheduled release.

The books chapter about Trump, titled, He Loves Me, He Loves Me Not, recounts the doctors time working as the director of the National Institute of Allergy and Infectious Diseases a position he held for nearly 40 years before retiring in 2022. About 70 of the books 450 pages are focused on Trump, the New York Times reported .

Much of their relationship, Fauci wrote, involved Trump alternately praising him then excoriating him for things hed said about the COVID-19 pandemic. In one June 2020 phone call from Trump, the former president unleashed his fury on him for saying the virus vaccine was unlikely to provide lifetime protection and would probably require boosters, according to book excerpts obtained by the Daily Beast .