As a legal scholar, Eric Posner is careful not to prejudge anything about the special counsel's investigation of President Donald Trump and his team. As he notes, we have no idea what Robert Mueller's team has discovered, or what it will be able to prove in court.

But the University of Chicago law professor feels it isn't too early to come to one important conclusion.

"I do think a real flaw has been exposed," he said in a telephone interview. "You do need to be able to remove the president if he engages in abuses. It's too hard to do that. I would have liked it if the founders had put in a better system to deal with that.

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