As she asked the U.S. Supreme Court this month to overturn President Trump’s election loss, the attorney Sidney Powell cited testimony from a secret witness presented as a former intelligence contractor with insights on a foreign conspiracy to subvert democracy.

The Washington Post identified the witness by determining that portions of her affidavit match, sometimes verbatim, a blog post that the pro-Trump podcaster Terpsichore Maras-Lindeman published in November 2019. In an interview, Maras-Lindeman confirmed that she wrote the affidavit and said she viewed it as her contribution to a fight against the theft of the election.

In a recent civil fraud case, attorneys for the state of North Dakota said that Maras-Lindeman falsely claimed to be a medical doctor and to have both a PhD and an MBA. They said she used multiple aliases and social security numbers and created exaggerated online résumés as part of what they called “a persistent effort . . . to deceive others.”

Powell’s reliance on Maras-Lindeman’s testimony may raise further questions about her judgment and the strength of her arguments at a time when she is becoming an increasingly influential adviser to the president.