President Trump’s former national security adviser, Michael Flynn, acknowledged in court last week that he lied to F.B.I. investigators about his communications with the Russian ambassador to the United States in the run-up to Mr. Trump’s inauguration. While Mr. Flynn pleaded guilty to only one count of making materially false statements, his admissions leave little doubt that he also violated a federal criminal statute known as the Logan Act. Mr. Flynn’s filings further reveal that a “very senior member” of the Trump transition team almost certainly violated the Logan Act, too.

We do not yet know the identity of this “very senior” official. Possibilities include Jared Kushner, who is Mr. Trump’s son-in-law; Mike Pence, vice president-elect at the time; and Mr. Trump himself. Whoever it was, Robert Mueller, the special counsel, can make out a powerful criminal case against that person.

The Logan Act makes it a crime for a United States citizen, “without authority” from the federal government, to communicate with foreign officials in order to “influence the measures or conduct of any foreign government” in a dispute with the United States or “to defeat the measures of the United States.” A conviction can result in a prison sentence of up to three years.

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