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He was working for Ukraine without the knowledge or permission of US Govt.
That’s espionage.
And he admits to that, so it’s probably worse.
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He's a Soviet born, active US military officer, disobeying his commander-in-chief, misrepresenting his commander-in-chief, working secretly behind the back of his commander-in-chief and participating in an unconstitutional process to remove his duly-elected commander-in-chief.