A defiant Dr. Mehmet Oz addressed a group of Columbia University doctors who are calling for him to resign while taping his namesake show on Tuesday.

A preview for The Dr. Oz Show slated to air on Thursday was released by show producers on Tuesday night, and the TV doctor makes zero apologies.

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Following his first public appearance since his daughter was found unconscious in her bathtub back in January, Bobby Brown rushed back to Bobbi Kristina's bedside in order to supervise her care and pray for a miracle.

Krissi's prognosis remains grim, yet Bobby has repeatedly delayed the decision to remove her from life support in hopes that she'll defy the odds and regain consciousness.