Meghan Markle’s dad says he hopes to sue her five close friends who revealed details of her letter to him.
Thomas, 76, has spoken to lawyers and is trying to get the pals’ names to file a lawsuit.
He also has his sights on US magazine People, which published an article about the five.
Thomas told the Sunday People: “I’m trying to get the names and I’ll take legal action.
“There were lies told about me, it’s defamation. The magazine might be liable too and the people who gave the information – but nobody seems to want to give up their names.”
Meghan, 39, won a High Court privacy claim against a newspaper last month for printing extracts of her letter to him.
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Thomas – who had vowed to give evidence against his daughter at a trial – said he gave the newspaper the letter after being enraged by an article in the US magazine revealing its existence.
Under the headline “The truth about Meghan”, the piece was based on anonymous interviews with the five pals and was the first public reference to the letter.
Thomas, who lives in Rosarito, Mexico, had said in a witness statement he had been forced to act to defend himself, claiming the article was untrue and portrayed him as dishonest and coldhearted.
He has also dropped in a letter to Oprah Winfrey asking her to interview him as she did Meghan.
Thomas said: “It’s about the truth. I want the truth out.”