Following their wedding and honeymoon it's been back to business for Harry and Meghan, who attended her first joint engagement with Queen Elizabeth last week.
He also revealed he spoke to Harry about politics, and had held conversations with the duke about Donald Trump and Brexit. "He said, 'Give Donald Trump a chance.' I sort of disagreed with that".
Kensington Palace, which speaks for Harry and his brother William, declined to comment on the interview.
He had been due to take part in the ceremony, but after a flurry of sometimes contradictory statements to an American news website, he eventually stayed away, saying he needed heart surgery.
When Thomas dropped out to have heart surgery after it was revealed he had been staging paparazzi photos, Meghan asked Charles to walk her down the aisle instead. "Watching it was hard for me, because I wasn't there, but at the same time ..."
"Harry asked for her hand on the phone, and I said: 'You are a gentleman".
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Prince Charles stepped in to take over Markle's duties and ended up walking Meghan down the aisle. I was thrilled to tears that he was doing that for me. "Promise me you will never raise your hand against my daughter, and of course I will grant you my permission, '" he said. "But he was wonderful to them".
Seemingly unfazed by his daughter marrying into the royal family, Mr Markle said she had "been a princess since the day she was born", adding: "He made a good pick, didn't he?"
He said that he expects his daughter and Harry will want to try for children soon.
On the subject of the United Kingdom leaving the European Union, or Brexit, Markle said: "It was just a loose conversation about something we have to try".
Of Harry, Markle said: "He's quite easy to talk to".
"They were disappointed, but they both said, 'Take care of yourself, we're really anxious about you, '" Markle explained, adding that Meghan did cry over the phone.