The New York City judge overseeing the criminal case against former President Donald Trump has received dozens of threats in recent days, police sources told ABC News.

Trump himself had lashed out at Judge Juan Merchan, calling him "Trump hating." Merchan previously oversaw the tax fraud trial of the Trump Organization that ended in a conviction.

There was no immediate comment from the Office of Court Administration on Merchan's security.

This is a developing story. Please check back for updates.