Watch: Piers Morgan walks off Good Morning Britain following heated discussion with Alex Beresford over Harry and Meghan interview
The pair were discussing the Duke and Duchess of Sussex's interview with Oprah Winfrey, which aired on ITV on Monday night, when former weather presenter Beresford accused Morgan of having a vendetta against Meghan because she had ended their friendship after becoming engaged to Prince Harry.
Beresford said: "I understand that you've got a personal relationship with Meghan Markle, or had one, and she cut you off. She's entitled to cut you off. Has she said anything about you since she cut you off? I don't think she has. But yet you continue to trash her."
Morgan got up from his seat at the GMB desk and began to walk out saying: "Okay, I'm done with this. Sorry. See you later. Can't do this."
He muttered something to Beresford as he passed him.
Beresford then told Susanna Reid and viewers: "This is absolutely diabolical behaviour. Piers spouts off on a regular basis.
"He has the ability to come here and talk from a position where he doesn't fully understand."
The show then went to a break, with Reid saying: "I think we should just pause there."
Shortly before he stormed out, Morgan had interrupted Beresford, asking, "Do you mind waiting?"
Beresford had rolled his eyes as he replied: "Actually no I don't, carry on."
Morgan returned to the studio to continue the discussion about racism with Beresford, Reid and Dr Hilary Jones.
At the end of the segment Morgan made a joke about healing family rifts in relation to himself and Beresford.
Morgan has now tweeted in defence of his actions: "I just prefer not to sit there listening to colleagues call me diabolical."
Morgan has previously spoken about how he was friends with Meghan Markle when she first came to the UK as an actor and star of Suits.
But when she began dating Prince Harry she cut the former tabloid editor out of her social contacts.
Morgan has been continually outspoken in his condemnation of Meghan Markle and Prince Harry's decision to leave the royal family.
He has been dismissive of Meghan's claims she received racist treatment by the British media and also mocked her claims in her interview with Oprah that she had suicidal thoughts while pregnant with Archie.
Mental health charity Mind released a statement on Monday night condemning Morgan's comments.
Mind said: "We were disappointed and concerned to see Piers Morgan's comments on not believing Meghan's experiences about suicidal thoughts today. It's vital that when people reach out for support or share their experiences of ill mental health that they are treated with dignity, respect and empathy. We are in conversations with ITV about this at the moment."
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Watch: Piers Morgan has ridiculed Meghan's interview with Oprah