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Good Morning Britain presenters were left stunned after a fathers' rights campaigner undid his trousers live on air and threatened to expose himself.

Cameras suddenly cut away as the founder of Fathers for Justice, Matt O’Connor, undid his belt and reached below his trousers on Friday morning’s show.

He had grown angry during a debate about whether Father’s Day should be scrapped with hosts Kate Garraway and Ranvir Singh, along with Ollwyn Moran, a child development specialist.

After insisting the day should be celebrated, the father of three suddenly said: "I've just got to say one important thing here.

"I was treated like an outcast today in this studio, I was put - not in the green room with Ollwyn - but dumped outside.

"And I've got to say one thing, I'm going to show you my balls."

But as the rest of the panel shouted “no, no, no” and the cameras cut away, he pulled out two pairs of small pink balls from his trousers and flung them onto the table.

"Balls, balls to a fatherless Father's Day,” he said.

Both hosts apologised and said there must have been a “technical reason” for his pre-show complaint, but Mr O’Connor persisted and said: “I have been coming here for 20 years and I have never been treated like that."

Garraway, who was filling in for usual hosts Piers Morgan and Susanna Reid, replied: "I will talk to you afterwards about today but we always separate guests who are going to be part of a debate."