In February 2024, Miller replaced Charlie Sykes as host of The Bulwark Podcast. He is also an MS NOW (formerly MSNBC) contributor, a frequent guest on progressive outlet Crooked Media's Pod Save America podcast, and co-hosts a regular series on Brian Tyler Cohen's YouTube channel called Inside the Right.
He is a writer for The Bulwark and Rolling Stone. He has written in support of Omar Ameen, an Iraqi refugee accused by Trump of being a member of ISIS. A Rolling Stone column by Miller on seeking background comments from reluctant Republican Trump supporters elicited a widely shared quote, "There are two options, you can be on this hell ship, or you can be in the water drowning".
His memoir of working in pre-Trump era Republican politics, Why We Did It: A Travelogue from the Republican Road to Hell, was published by Harper in June 2022. The book details Miller's political career, analysing the rise of Trump and the motivations of Republican politicians who remained firmly loyal to the MAGA movement, and reached #2 on The New York Times non fiction list in July 2022.
The book was positively received for its writing style and analysis of political changes within the post-Trump GOP during the late 2010s and early 2020s. In a review for The New York Times, Jennifer Szalai called the book "darkly funny" and praised Miller's insights into the inner workings of the Republican Party and the Washington, D.C., political scene. New York Times columnist David French wrote that it offered "painful" insights into the impact of partisanship and Trumpism on the American conservative Right.
