Federal officials have charged a 21-year-old member of the Massachusetts Air National Guard with posting a trove of classified documents online. Politico’s Erin Banco explains.This episode was produced by Avishay Artsy and Haleema Shah with help from Amina Al-Sadi. It was edited by Matt Collette, fact-checked by Laura Bullard and Victoria Chamberlin, engineered by Paul Robert Mounsey and Patrick Boyd, and hosted by Noel King.Transcript at vox.com/todayexplained  Support Today, Explained by making a financial contribution to Vox! bit.ly/givepodcastsLearn more about your ad choices. Visit podcastchoices.com/adchoices