Her father's chest pains "have been triggered by emotional upset", TMZ reports, and Markle credits his oldest daughter, Samantha Markle (Meghan's half sister) as one reason.
Samantha's boyfriend, Mark, told TMZ they were driving in Florida near a toll booth when they had a "paparazzi confrontation".
Hounded by the paparazzi, Markle's father has been caught up in the complex and often bitter relationship between Britain's royals and the media ahead of Saturday's ceremony at Windsor Castle in southeast England. "Not allowed to get excited".
The 71-year-old superstar will take to his famous piano and serenade the newlyweds two decades after his iconic rendition of Candle in the Wind at the funeral of Harry's mother, Princess Diana.
Casting was spot on with Parisa Fitz-Henley as Meghan Markle in Harry & Meghan: A Royal Romance.
Previously, he was announced by Kensington Palace to walk Meghan down the aisle.
'He would have moved heaven and earth to be there'.
Members of Ms Markle's family have travelled to the United Kingdom amid intense attention from the world's media. Her boyfriend said he swerved to the left in an attempt to avoid him and hit a concrete barrier.
Mr Markle Jr reportedly said Kensington Palace should have offered his father more guidance about how to handle the intense media spotlight.
Markle threw the wedding plans into confusion earlier this week when he said he would not attend the May 19 nuptials because he did not want to embarrass his daughter.
On Monday, he reportedly missed a call from his daughter and she later told him she loved him in a text message and said she was concerned about his health.
Meghan Markle's dad's heart surgery was a success.
He recently said he thinks she would approve of Harry's choice of bride.
Despite her parents divorcing when she was six, Harry's future wife has remained close to her father. (The royals actually held a service of "prayer and dedication" in the Chapel and wedded nearby at Windsor Guildhall.) Meanwhile, the next royal wedding to be held in the Chapel after Markle and Prince Harry will be between Princess Eugenie and Jack Brooksbank later this year on October 12, 2018.