Piers Morgan has called out Prince Harry for 'preaching' about mental health.

A trailer was released by Apple TV revealing Harry's new documentary about mental health alongside Oprah Winfrey.

Former GMB host, Piers, has viciously branded the Duke of Sussex a "whiny little brat" as he blasted his "preaching" amid "publicly trashing his family".

Among the stars opening up about their experiences are Lady Gaga and Prince Harry, who open up in emotional scenes on The Me You Can't See.

But Piers wasn't too impressed and took to Twitter to give his immediate verdict on the trailer, the Mirror reports.

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Piers isn't impressed with Prince Harry's latest trailer

Retweeting the trailer, Piers furiously tweeted: "....because the one thing the world REALLY needs in the middle of a pandemic is yet more preaching lectures on compassion, mental health & emotional wellbeing from a whiny little brat who spends his entire time publicly trashing his family."

This comes after the ex-Good Morning Britain presenter demanded that the Duke of Sussex "grow a pair" and urged the Queen to show him who is boss.

Prince Harry also recently sat down with actor Dax Shephard for the Armchair Expert podcast in which he opened up on his "genetic pain" and said he wants to "break the cycle" of the "suffering" of his upbringing with his own children.

Piers reflected on the interview in his latest column for the MailOnline in which he penned that Prince Harry has "gone from being a courageous war hero to a spineless whiny cry baby who blames his family for all his supposed woes."

In a strong attack on the son of Prince Charles, Piers fumed: "Harry has lost his country, his dignity and now seems to be losing his mind too as he condemns everything from his grieving grandmother to free speech.

"It's time His Royal Hypocrite stopped abusing his family, stopped moaning about everything all the bloody time.

"He should stop exploiting his royal titles for huge financial gain, stop trashing America's constitution - and grow a pair."