On Friday, Trump, who was not charged in his company's case, lashed out at Merchan on his Truth Social platform.
"The Judge 'assigned' to my Witch Hunt Case, a 'Case' that has NEVER BEEN CHARGED BEFORE, HATES ME," wrote Trump, who has launched a campaign to regain the presidency in 2024.
Merchan has been a Manhattan criminal court judge since 2009 after prior stints on the state's Court of Claims, which hears cases against the state and its agencies, and family court in the Bronx.
Merchan presided over the 2012 case of the so-called "Soccer Mom Madam" Anna Gristina, which garnered lurid headlines in the New York media.
Gristina sued Merchan in 2021 to unseal records in her case as part of an effort to vacate her record.