A royal expert has questioned what Meghan Markle and Prince Harry have "actually achieved" since abandoning their royal duties two years ago.
The Duke and Duchess of Sussex will make a return to the UK in September as they visit several charities that are "close to their hearts", in what will be their first joint visit since the Platinum Jubilee.
Ahead of the couple's visit, royal expert Daniela Elser has questioned the success of the couple's decision to step away from their royal status.
Harry and Meghan are set to return to the UK in September.
Caitlin Ochs
Ms Elser claims the pair have not made any inroads when it comes to US politics.
PA Features Archive/Press Association Images
Writing for News.com.au, Ms Elser said the pair have failed to make a mark on US politics:
She said: "Sadly, for two people who seem to truly care, there is not one issue, not one cause they have really moved the needle on since they embarked on this new life of theirs.
"The bottom line is Harry and Meghan have proven totally unsuccessful at making themselves matter in the corridors of power in Washington, New York, Silicon Valley or Los Angeles."
Ms Elser also questioned whether the "Sussex/Netflix marriage" will be able to "survive", adding: "Potentially hundreds of millions of dollars are riding on this docuseries for the self-supporting, private jet-flying, polo-loving Sussexes.
"If it turns out that the Duke and Duchess are TV gold, if they are about to demonstrate that they are binge-worthy stars who can pull in streaming viewers globally, then their US careers are set. Get another polo pony! Hell, buy seven.
"But, if they fail to live up to the hype and the rhetoric? The huge sums being touted and all those lovely millions supposedly coming their way could dry up faster than a Californian lake."