Luis Elizondo offers window into US government's hunt for UFOs

Longtime Defense Department researcher Luis "Lue" Elizondo has become well-known for reporting the existence of UFOs (unidentified flying objects), now known as unidentified anomalous phenomena (UAPs).

In his new book, "Imminent: Inside the Pentagon's Hunt for UFOs," which is available now, former Pentagon insider Elizondo invites the reader into this hidden world.

He joined ABC News' Stephanie Ramos to discuss why he decided to write the book, government secrecy around UAPs, official comments on these phenomena and some of his own unusual experiences.