because Gowdy knows stuff that we don't know, and he's alluding to it
Gowdy was given the highest security clearance by POTUS.
He potentially knows EVERYthing.
Watch this space.
Watch the water too.
It's called a 'criminal referral'.
Congress finds information that suggests a crime has been committed.
They "refer" it to the Department of Justice to consider for criminal prosecution.