On Wednesday, documentary filmmaker Michael Moore posted a mysterious threat on Facebook.
"I know Roseanne. And I know Trump. And they are about to rue the day they ever knew me," he wrote.
It's not clear what he's referring to, but seems to tease a future project exposing Donald Trump and Roseanne Barr.
Moore, famously, is one of the few progressive voices that predicted a Trump victory in 2016.