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Thomas Markle has already accused his daughter of "cheapening" the British royal family in part of an interview released on Sunday, a day after Buckingham Palace said Harry and Meghan would no longer be working members of the monarchy.
The couple's decision to cut down on official engagements has sparked turmoil in the royal family, and they will now give up royal duties entirely in order to pursue an independent future as a result of the Palace's announcement. They will divide their time between North America and Britain and currently are in Canada.
Aside from Sunday's clip, the rest of "Thomas Markle: My Story" was recorded for Channel 5 in October 2019 over six days at his home in Mexico, before that decision, and will be broadcast on Wednesday.
In extracts released by the broadcaster, the 75-year-old gives his perspective on the rift with his daughter and apologises for missing Meghan (38) and Harry's (35) wedding.
Confusion over whether Meghan's father would come to Windsor to walk her down the aisle threatened to overshadow her wedding to Harry in May 2018, and eventually he did not travel after suffering a heart attack.
"I want to apologise to the Queen and to the royal family," he said in a clip regarding the wedding.
Markle said that the portrayal of him in the media had been unfair and that he decided to make the documentary "because I want everyone to know that I'm not all the trashy things that are being said about me."
"I want Harry and Meghan to see this video and know that this is not fair," he said.
Markle and his daughter have been estranged since her marriage to Harry. Earlier this month, Britain's Mail on Sunday newspaper submitted its defence to court action by Meghan over the publication of a private letter she sent her father.
He said that it was "almost a joke" that he heard news of Meghan's pregnancy on the radio rather than directly from his daughter, and said it was possible the couple would not see him again.
"The last time they might see me is being lowered into the ground," he said. "I don't think at this point they are thrilled to see me or want to talk to me."