Prince Harry urges American citizens to “reject hate speech” and vote for the country’s upcoming presidential election.
He made the remarks along with his wife Meghan on a US television broadcast.
A spokesman for the couple said the comments did not refer to any particular political party or candidate, but rather a “call for courtesy”.
Voting for the next U.S. president is set for November 3, with candidates including Donald Trump and Democrat Joe Biden.
The Duke and Duchess of Sussex appeared in a live video as part of Time 100 at their California residence – a list compiled by Time magazine to celebrate the most influential people in the world.
This is their first joint TV show after them In March he ceased to be a member of the Royal Family.
“As we approach this November, it is imperative to reject hate speech, misinformation and online hostility,” Duke said while sitting on a bench with Meghan.
He reminded Americans to be prudent in the content they consume online.
“When evil outweighs good, for many, whether we realize it or not, it reduces our ability to be compassionate and our ability to put on someone else’s shoes,” he said.
“Because when a person buys a negative online, the effects are felt tremendously. It’s not just a reflection, it’s time to take action.”
‘You deserve to be heard’
The 36-year-old Duke said he would not vote in the election because he was not an American citizen and that he had never voted in a UK election.
Members of the Royal Family traditionally do not vote and the Queen is politically neutral.
Although UK law does not prohibit royalty from voting, they consider it unconstitutional to do so.
Harry and Meghan set aside the roles of Senior Working Royals in March for personal and financial freedom. They now live in the US, but are still members of the Royal Family.
Sarah Campbell, BBC News Royal Correspondent
When Harry and Meghan Royals ceased to work in March, the official “divorce” statement read: “They can no longer officially represent The Queen, making it clear that Sussex will continue to uphold Her Majesty’s values in everything they do.”
Harry’s contribution to the Time video message attracted a lot of comments.
His spokesman made it clear that Duke was making an “impartial call for decency.”
As the Trump administration generally accuses Harry of calling traits – “hate speech, misinformation and online hostility” – his contribution has been widely commented on politically by the party.
While the Royals remain neutral, the question that bothers many today is whether Harry’s words contradict the statement issued by the Palace in March.
As this latest episode makes clear once again, it will always be difficult for Sussex and the Royal Family to work their way through their royal / non-royal status for satisfaction.
The Duchess mocked then-Republican candidate Mr Trump on a 2016 television show, calling the November poll “the most important election of our lives.”
“When we vote, our values come into play and our voices are heard. Your voice is an important reminder to you, because you do and you deserve to be heard,” she said.
A spokesman for the couple said: “His message is not about any particular political party or candidate, but rather about how we should engage, interact with each other and use information – especially a call for courtesy online.”