Background reading:

• According to President Trump’s lawyers, Mr. Mueller’s investigators said that they would abide by the Justice Department’s legal and historical precedent to refrain from prosecuting sitting presidents.

• Any discovery of wrongdoing by the president might instead be referred to Congress for a decision, as was done when Presidents Richard M. Nixon and Bill Clinton were under investigation.

• It has been one year since Mr. Mueller was appointed special counsel to look into a dizzying array of events that span years and continents. Here's a guide to what has happened.

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