Re: Captain Sisko in First Contact
The regulation may have a different name, but I'm pretty sure a CMO would have the ability to relieve a captain under those conditions.
Regardless of universe.
Kirk and Matt Decker were both threatened to be relieved of command due to emotional duress.
"I had no idea you were so... formidable. " - Anan 7 to James T. Kirk, A Taste of Armageddon