Fulton County District Attorney Fani Willis has been subpoenaed to testify in a colleague’s divorce proceeding, according to a court filing, a development that could shed light on claims Willis and the colleague carried out an improper romantic relationship as they prosecuted former President Donald Trump and others.

In a court filing reviewed by The Wall Street Journal, a process server said he showed up at Willis’s office in Atlanta on Monday morning with a subpoena seeking her testimony in the Cobb County divorce case of Nathan Wade, a lawyer she hired as a special prosecutor in the Trump case, and his wife, Joycelyn Wade. The process server said he left the subpoena, filed by Joycelyn Wade’s lawyer, with Willis’s executive assistant.

Will she plead the 5th?