Seymour Hersh's bizarre new conspiracy theory about the US and Syria, explained

The investigative journalist says Pentagon leaders conducted a secret alliance with Assad and Putin to undermine Obama.

Updated by Max Fisher on December 21, 2015, 11:40 a.m. ET

Seymour Hersh, an investigative journalist famous for uncovering the 1968 My Lai massacre and the mid-2000s Abu Ghraib scandal, says there's another scandal afoot, and it's bigger than anything he's previously reported. Perhaps even bigger than his story from this May alleging that the US staged its mission to kill Osama bin Laden.

Seymour Hersh, an investigative journalist famous for uncovering the 1968 My Lai massacre and the mid-2000s Abu Ghraib scandal, says there's another scandal afoot, and it's bigger than anything he's previously reported. Perhaps even bigger than his story from this May alleging that the US staged its mission to kill Osama bin Laden.