In a candid interview with 60 Minutes ahead of the May 19 nuptials, the Australian writer said Ms Markle - who also describes herself as a feminist - had already sacrificed too much to marry the English prince, including her career and homeland.
"Meghan is a smart girl", he said. I'm not going to do the bridesmaid dress.
"When you think about it, Diana was 36 when she died, Meghan was 36 when she arrives, and she's, in a way, physically picked up the flag that was dropped by Diana".
"She will bring a breath of energy and a different perspective". I hope, in a way, that she'll bolt.
We finally have a little bit more of an idea of what to expect from Prince Harry and Meghan Markle's royal wedding next month.
"The monarchy has become very commercialised, inadvertently", Morton said - through the intense interest in what the royals, especially the young ones, buy and wear.
"The Queen would have looked at Meghan and thought, 'American divorcee, let's think again, Harry, '" he said, adding that the monarch's blessing was "vital" for the wedding to go ahead. "I'm sure that the Fleet St mavens will be sharpening their quills to attack her at some point", Morton said about the United Kingdom tabloids. "In 100 years' time people will be saying they were destined for each other".
Markle's and Harry's relationship may have been the result of a series of lucky coincidences.
"Harry's Invictus Games is in Sydney in October so it would be easy for him to visit Melbourne for a role".
"The courtiers have got an asset here, 24-carat gold, and the question is how the family can best use it". Markle also recently starred on the television show "Suits".
Morton spoke to old friends and family of Markle in the USA, though he says he has not met Markle in person.