Everything having to do with President Trump and Russia, whether it is Mr. Trump's demand for an investigation into the investigation by the special counsel Robert Mueller, or whether Mr. Trump will testify, requires an answer to one essential background question: Can Mr. Mueller seek to indict the president?

There is no doubt that dissents can serve a useful role by explaining when a justice thinks the majority has gone off the deep end. But unanimity also sends its own powerful message - one that might be eclipsed in the headlines by a sensational dissent but could ultimately have a greater impact.

Unanimity is important because it signals that the justices can rise above their differences and interpret the law without partisanship.

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