Ummmmmmm... firing your own Secretary of State in order to protect the leader of a country that's been hostile to the US for most of the last century? Most rational people would also consider that evidence. Circumstantial, yes, but admissable. And Oooooooh so damning.
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"When you're up to your ass in alligators, it's hard to remember that you set out to drain the swamp" -- HST