A legal order requiring a person to testify as a witness, it sometime also requires a person to turn over documents or other records under their control. Kavanaugh should expect to be asked whether the president can be subpoenaed, an open legal question that could reach the Supreme Court if Mueller tries to force the president to testify as part of the Russia investigation. Also an open question: Whether the president can be indicted, meaning charged with a crime.

Trump Russia Probe News Guide

FILE - In this Dec. 15, 2017, file photo, President Donald Trump sits with Attorney General Jeff Sessions during the FBI National Academy graduation ceremony in Quantico, Va. Late last year, lawyers for Trump expressed optimism that special counsel Robert Mueller was nearing the end of his probe of Russia’s interference in the 2016 election. (AP Photo/Evan Vucci, File)

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