Piers was asked to apologise for his comments but the broadcaster refused.
This included Piers publicly standing by what he said in a tweet on March 10.
He wrote: “On Monday, I said I didn’t believe Meghan Markle in her Oprah interview. I’ve had time to reflect on this opinion, and I still don’t.
“If you did, OK. Freedom of speech is a hill I’m happy to die on. Thanks for all the love, and hate. I’m off to spend more time with my opinions.”
While Piers’ interview will be broadcast on Fox Nation at 4pm on Monday, it is not yet clear if it will be available in the UK.