Phillip Schofield has been branded an "arch manipulator" with a "stranglehold" over This Morning.
The 57-year-old former children's TV presenter took over co-hosting the ITV daytime show with Fern Britton in 2002, but their working relationship broke down and Britton was replaced by Holly Willoughby in 2009.
Britton's former agent Jon Roseman told The Daily Mail: "From day one he began to interfere with the editorial content of the show. Fern always left it to the editor, a mistake she attempted to rectify, but too late.
"His stranglehold was too tight by the time she recognised what he was up to. Their ability to work together was up there with the Eamonn Holmes/Anthea Turner friction.
"He befriended Simon Shaps, the then boss of the network centre. After this friendship, all bets were off ... he just got what he wanted."
Roseman called the Dancing On Ice presenter and "arch manipulator".
Schofield is currently embroiled in a bitter feud with Amanda Holden, who is thought to have a bee in her bonnet after Schofield blocked her from joining him as guest co-host on This Morning will Willoughby was away in Australia filming I'm A Celebrity... Get Me Out Of Here!
Schofield took to social media at the weekend to confess he had been upset by reports that have emerged claiming he is difficult to work with.
The end of another really sad weekend. When you try for 35 years to be the easiest, most fun person to work with and you read such hurtful and wildly untrue stories from nameless 'sources'. Obviously I'll take it on the chin.. I just hope you know me better.
Meanwhile, Holden claims to have tried to call a truce.
Speaking on her radio breakfast show on Heart FM Holden told co-host Jamie Theakston: "I've moved on from it, Jamie, you need to move on from it."
He replied: "You might have moved on but I just wanted to know, is there any more to the story?"
She said: "I did offer to meet him for a coffee months ago, he didn't reply to my text. What can I say?"
Theakston said: "The olive branch had been extended," to which she replied: "Oh yes."
Phillip Schofield and Holly Willoughby on stage collecting the award for Best Magazine during the 2011 National Television Awards at the O2 Arena, London.
Jason Dononvan (left), who is currently playing "Joseph" in the hit Andrew Lloyd Webber and Tim Rice musical "Joseph and the Amazing Technicolor Dreamcoat", hands over his "dreamcoat" to TV presenter Phillip Schofield at the London Palladium.
Phillip Schofield (left) with composer Andrew Lloyd Webber at the London Palladium. The composer was so impressed with Phillip's performance in Joseph and the Amazing Technicolor Dreamcoat that he offered him the full-time role from May when Jason Donovan's contract runs out.
TV Presenters phillip schofield and Anthea Turner with The Medieval Babes during a photocall in London today (Sunday) to launch, Happy New Year Live from Edinburgh's Hogmanay, Scottish Television's turn of the year programme. The show will be presented by Schofield and Turner and will feature a range of events from Edinburgh's Hogmanay, the UK's biggest street party. Headline band Texas will play live to a TV audience for the first time and will be supported by a range of nusical acts including The Medieval Babes, Space and the Saw Doctors. Photo by Peter Jordan/PA.
Phillip Schofield, star of the forthcoming show 'Dr Dolittle', stands surrounded by young hopefuls outside the Hammersmith Apollo in west London today (Tuesday) where auditions are being held for the child's role of 'Tommy Stubbins' in the muscial which opens this July. Photo by Stefan Rousseau/PA
PA NEWS PHOTO 9/7/98 THE MYTHICAL CREATURE 'PUSHMI-PULLYU' ON STAGE WITH PHILLIP SCHOFIELD, WHO PLAYS THE TITLE ROLE IN THE NEW PRODUCTION OF THE CLASSIC STORY 'DR DOLITTLE', SHOWING AT THE APOLLO THEATRE IN LONDON.
PA NEWS PHOTO 25/11/98 PHILLIP SCHOFIELD WITH CHI CHI THE MONKEY AND BABY PUSHMU PULLYU (FROM DOCTOR DOLITTLE), AT LONDON'S HAMMERSMITH APPOLLO WHERE THE TUBEROUS SCLEROSIS ASSOCIATION LAUNCHED ITS 21ST ANNIVERSARY 5 MILLION CHARITY APPEAL.
TV presenter Phillip Schofield arrives with his wife Stephanie, and children Ruby (right) and Molly for the celebrity film premiere of Harry Potter and the Chamber of Secrets at the Odeon Leicester Square in London's West End.
This Morning presenters Phillip Schofield and Fern Brittain arrive for the TV Quick awards at the Dorchester Hotel, in London.
This Morning presenters Phillip Schofield and Fern Britton arrive for the Britsh Soap Awards at BBC TV Centre in west London. Hosted by Paul O'Grady, the show will be broadcast on ITV1.
Phillip Schofield (left) and Holly Willoughby arrive for the British Academy Television Awards, held at the London Palladium, central London. PRESS ASSOCIATION Photo. Picture date: Sunday 20 May 2007. Photo credit should read: Yui Mok/PA Wire
Phillip Schofield and family arrive for the premiere of 'Jonas Brothers: The 3D Concert Experience' at the Empire cinema in Leicester Square, London.
Phillip Schofield with the Entertainment Programme award received for The Cube at the Philips British Academy Television Awards at the Grosvenor House, 90 Park Lane, London.
The Duchess of Cornwall meets Phillip Schofield during a reception for members of the media at Buckingham Palace, London.
Holly Willoughby, Phillip Schofield, Eamonn Holmes and Ruth Langsford backstage at The National Television Awards 2013, The O2 Arena, Greenwich, London.
Phillip Schofield and Holly Willoughby filming at This Morning's original Liverpool dock location celebrating the show's silver anniversary.
Phillip Schofield, Holly Willoughby and the cast and crew of This Morning collect the best daytime award on stage during the 2014 National Television Awards at the O2 Arena, London.
Phillip Schofield and Holly Willoughby backstage at the National Television Awards 2014, O2 Arena, Greenwich, London.
TV OUT. INTERNET OUT. No cropping permitted. Picture must be credited to ITV. We are advised that videograbs should not be used more than 48 hours after the time of original transmission, without the consent of the copyright holder. Video grab taken from ITV of This Morning presenter Holly Willoughby crying as she and her co-host Phillip Schofield spoke to Amy, an inspirational teenager, who was at Wellington school in Ayr.
Embargoed to 0001 Wednesday April 20 Phillip Schofield models his old technicolour dreamcoat at the Music Rooms in New Cross Gate, London, as he prepares to revive the role for a special short run tour.
Queen Elizabeth II greets Phillip Schofield at a reception for the Queen's Young Leaders Awards at Buckingham Palace in London.
Holly Willoughby and Phillip Schofield with the award for best Live Magazine Show in the press room at the National Television Awards 2017 held at the O2, London. Photo credit should read: Doug Peters/EMPICS Entertainment
The Prince of Wales (right) with Phillip Schofield and Emilia Fox as they attend the Prince's Trust Celebrate Success Awards at the London Palladium.
Phillip Schofield and Holly Willoughby present the trophy for The King Edwards VII Stakes during day four of Royal Ascot at Ascot Racecourse.
(left to right) Ashley Banjo, Jason Gardiner, Phillip Schofield, Jayne Torvill and Christopher Dean attending the Dancing on Ice Photocall held at the Natural History Museum, London. Photo credit should read: Doug Peters/EMPICS Entertainment
Holly Willoughby and Phillip Schofield with their best daytime award for This Morning at the National Television Awards 2018 held at the O2 Arena, London.
This Morning presenters (back row left to right) Gok Wan, Lisa Snowdon, (front row left to right) Bryony Blake, Rylan Clark-Neal, Holly Willoughby, Phillip Schofield and Alison Hammond during a photocall at the ITV Studios, Southbank, London.
Phillip Schofield attending the 14th BGC Annual Charity Day at Canary Wharf in London, in commemoration of BGC's 658 colleagues and the 61 Eurobrokers employees lost on 9/11.
(Left to right) Phillip Schofield, Holly Willoughby, Judy Finnigan and Richard Madeley arriving for a Bafta tribute event to This Morning, at Bafta in Piccadilly, London.
Holly Willoughby (left to right), Phillip Schofield, Jayne Torvill and Christopher Dean (right) during the press launch for the upcoming series of Dancing On Ice at the Natural History Museum Ice Rink in London. Picture date: Tuesday December 18, 2018. Photo credit should read: David Parry/PA Wire
Phillip Schofield (left) and Holly Willoughby with the award for best Daytime Show in the Press Room at the National Television Awards 2019 held at the O2 Arena, London. Photo credit should read: Doug Peters/EMPICS