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b'There have only been a handful of investigations into possible criminal conduct by a sitting president of the United States. Each time, an outside investigator has been appointed under a set of rules to ensure independence and accountability \\u2014 and those rules have changed with each inquiry. Now, the latest set of rules is being tested as the special counsel, Robert Mueller, prepares to release his report. Guest: Neal Katyal, a lawyer who drafted the regulations that govern the special counsel investigation. For more information on today\\u2019s episode, visit nytimes.com/thedaily.'