Fulton County District Attorney Fani Willis has been subpoenaed to testify in a fellow prosecutor’s divorce proceedings, according to a court filing, in a move that could reveal more information about claims that Willis and the colleague engaged in an improper affair as they prosecute former President Donald Trump.

A process server said he arrived at Willis’s office in Atlanta on Monday with a subpoena seeking testimony in the Cobb County divorce case of Nathan Wade, a local attorney she hired to be special prosecutor in the Trump case, and his wife, Jocelyn Wade, according to court filings reviewed by the Wall Street Journal.

This is a developing story and will be updated.