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I am thinking this is highly possible, but even if not the trial seems problematic unless McCabe has actual evidence. It seems to come down to the word of Andrew McCabe v James Comey. McCabe has his own credibility issues here since Jeff Sessions (under Trump) fired McCabe to leaking the info. This seems a bit like McCabe is trying to take some of the tarnish off his reputation.
Regardless this really stinks of more Trump using the power of government and lawfare against his enemies.