Piers Morgan branded climate change activist Greta Thunberg "unstable" on today's Good Morning Britain.
The GMB presenter claimed the 16-year-old Swedish schoolgirl was "vulnerable" and comes from a "damaged background".
Admitting the message she preaches is good, Piers confessed he did not feel comfortable watching her at the UN Climate Action Summit.
He went on to insist that Greta, as the figurehead for a movement, should be open to criticism and held accountable.
But his co-host Susanna Reid admitted she felt "uncomfortable" listening to Piers criticising the schoolgirl.
Speaking about Greta, Piers said: "The message she is delivering, very important and I agree.
"I do think climate change is real, I do think it is a danger, I do think that we have probably not done enough to combat it and we need to do more.
"My issue with Greta, she is not just a regular 16-year-old kid. She has Asperger's Syndrome and she has a history through her childhood of depression, of OCD, all diagnosed by doctors.
"She went through two months without eating. Months without talking to anyone but her family.
"There is a damaged background there to what's going on that should not be ignored.
"When I watched her the other day she was displaying, you can correct me if you think this is wrong, one of the characteristics of Aspergers is you get a very obsessional interest in a narrow focus issue.
"And you also can suffer things like pain and fear far more intensely than people that don't have Asperger's syndrome.
"Put this all together and I saw a vulnerable kid up there, preaching a good message but I didn't feel comfortable watching her up there knowing what I know about her life.
Extinction Rebellion co-leader Skeena Ratho argued that the "powerful young woman" is daring to express what a lot of young people are thinking and inspiring millions.
Piers replied: "Isn't she also terrifying millions of young people so that eco-anxiety is on the rise which is a genuine obsession that the world is about to end. We should be doing more but the world is not about to end."
Susanna admitted she felt uncomfortable with people criticising the teenager and claimed calling her unstable was "unfair".
Hitting back, Piers insisted that "she is unstable" before arguing she should be held accountable.
Piers added: "I think if your parents are going to put you on a global stage and encourage you to be a political activist about this issue then you have to accept some criticism and scrutiny.
"If you feel uncomfortable to the point she can't be criticised then she should step aside and go back to school.
"I don't feel comfortable necessarily criticising her but she is now the figurehead, she should be susceptible to the same rules everybody else is, who wants to adopt that position."
*Good Morning Britain airs weekdays on ITV at 6am
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