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Mueller haunts the West Wing
J. Scott Applewhite / AP

Steve Bannon provoked lots of chatter for telling Charlie Rose on "60 Minutes" that President Trump's firing of FBI Director James Comey may have been the worst mistake in "modern political history."

What's intriguing is the reason he said it: the belief of some close White House allies that special counsel Bob Mueller, whose appointment was triggered by Comey's ouster, could use events surrounding the firing to make an obstruction of justice case against Trump.

There's a good reason that Vice President Pence has hired a lawyer, Bannon freaked out about the decision, and Mueller plans to interview a slew of current and former West Wing aides: They were with Trump during those frantic days, and know what he was saying and what was on his mind.