King Charles' upcoming royal tour will be scaled back, but he might travel to the United States to see his son, Prince Harry, according to a royal expert.

The Duke and Duchess of Sussex have been feuding with the royal family. King Charles didn't meet Prince Harry when he flew to the United Kingdom in May. However, royal biographer and expert Tom Quinn claimed that His Majesty might travel to California to see his youngest son and his children -- Archie, 5, and Lilibet, 3.

"Charles has had discussions about an official visit to the United States at some time in the future, and there is no doubt if it goes ahead, he would build in time to visit his youngest son and his grandchildren, but there are mountains of planning to be overcome before that becomes even a remote possibility," Quinn told the Mirror.

RELATED: Prince Harry, Meghan Markle's Rumored UK Return Is A Sign 'They Have Lost All Popularity In The States': British Socialite

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TOPSHOT - Britain's King Charles III and Britain's Prince Harry, Duke of Sussex walk behind the coffin of Queen Elizabeth II.
(Photo : (Photo by LOIC VENANCE / AFP) (Photo by LOIC VENANCE/AFP via Getty Images)

"King Charles has privately visited many other countries -- he made an unpublicised visit to Transylvania for example to check up on his rental properties -- so it's certainly possible that he would make a discreet private visit to Harry and the children in California. He is desperate to see them and hates the idea that Archie and Lily will not remember him as the warm, friendly grandfather he wants to be."

Quinn also claimed that Prince Harry has been looking for a new home close to his dad's Highgrove estate amid reports that the King wants to spend more time with his grandchildren. 

There are rumors that the Duke and Duchess of Sussex are moving back to the United Kingdom. However, Lizzie Cundy, a British socialite, TV personality and former wife of footballer Jason Cundy, said if this was true, then it was a sign that "they have lost all popularity in the States."

RELATED: Meghan Markle, Prince Harry 'Never Cared About The Royal Protocol' After 'Ridiculous' Blunder, Expert Claims

Prince Harry and Meghan Markle
 Prince Harry, Duke of Sussex and Meghan, Duchess of Sussex attend the Your Commonwealth Youth Challenge reception at Marlborough House on July 05, 2018 in London, England.
(Photo : Yui Mok - WPA Pool/Getty Images)

Meanwhile, King Charles' tour to Australia and Samoa will reportedly be scaled back, and the anticipated visit to New Zealand might be shelved. An unnamed source told the Mirror in a separate report that the changes "will be a bitter disappointment on both sides."

His Majesty is still receiving weekly treatment for cancer. He just returned to his public duties at the end of April and the monarch promised to "make up for lost time."

However, royal historian and commentator Rafe Heydel-Mankoo wasn't surprised about the report that his tours would be shortened. He noted that the King had been busy lately as he made several public appearances, including Trooping the Colour, Garter Day service, Royal Ascot and Cartier Polo.

King Charles
Prince Charles, Prince of Wales waves as he attends the Royal Cornwall Show on June 07, 2018 in Wadebridge, United Kingdom.
(Photo : Tim Rooke - WPA Pool/Getty Images)

"His treatment has to come first and he has to obey the advice of his doctors. So it's not necessarily surprising that His Majesty is going to have to shorten and cut back what was supposed to be a two-week trip to Australia and New Zealand," Heydel-Mankoo said on GB News.

"The trip to Australia, if these reports are correct, was going to be reduced to only six days. New Zealand to be completely omitted, which will be a great disappointment not only to His Majesty but also to New Zealanders."

King Charles and Prince Louis
Britain's Prince Charles, Prince of Wales (L) sits Britain's Prince Louis of Cambridge on his knee during the Platinum Pageant in London on June 5, 2022 as part of Queen Elizabeth II's platinum jubilee celebrations.
(Photo : FRANK AUGSTEIN/POOL/AFP via Getty Images)