Meghan, Duchess of Sussex, is suing the publisher of the British newspaper The Mail on Sunday after it published a handwritten letter she had sent to her father.

Prince Harry backed the actions of his wife in a powerful statement released on Tuesday evening local time, condemning the British tabloid industry’s bullying and “campaigns against individuals with no thought to the consequences.”

In a strongly worded statement, Prince Harry said that while he and Meghan regard media freedom and objective reporting as “a cornerstone of democracy”, there is “a human cost to relentless propaganda.”

“I cannot begin to describe how painful it has been,” he said, describing a “ruthless campaign” made by parts of the British press.

“Because in today’s digital age, press fabrications are repurposed as truth across the globe. One day’s coverage is no longer tomorrow’s chip-paper.”

Law firm Schillings, which will be representing the Duchess of Sussex, told Sky News it has filed a High Court claim against the Mail on Sunday and its publisher, Associated Newspapers.

In his statement, Prince Harry claimed the Mail on Sunday had misled readers by “strategically omitting select paragraphs, specific sentences, and even singular words” from a letter Meghan had sent, “to mask the lies they had perpetuated for over a year.”

It is, absolutely, one of the strongest public statements you will see out of any of the royal family.

“The positive coverage of the past week from these same publications exposes the double standards of this specific press pack that has vilified [Meghan] almost daily for the past nine months; they have been able to create lie after lie at her expense simply because she has not been visible while on maternity leave.”

“She is the same woman she was a year ago on our wedding day, just as she is the same woman you’ve seen on this Africa tour.”

“For these select media this is a game, and one that we have been unwilling to play from the start. I have been a silent witness to her private suffering for too long. To stand back and do nothing would be contrary to everything we believe in.”

“My deepest fear is history repeating itself…I’ve seen what happens when someone I love is commoditised to the point that they are no longer treated or seen as a real person. I lost my mother and now I watch my wife falling victim to the same powerful forces.”

The Mail on Sunday has denied it altered the Duchess’s letter in any way and stated it will be defending the case vigorously.