Donald Trump is fighting a war against knowledge. In his second term, he has fired the Librarian of Congress and the Archivist of the United States, and government websites have been altered to remove facts about climate change and Black history. Haven't we seen this kind of war against knowledge before?

• Guest: Richard Ovenden, the Bodley's Librarian in the University of Oxford and author of "Burning the Books: A History of Knowledge under Attack"
• Producer: Alex Tighe