Allegations of royal racism made by Prince Harry and Meghan Markle are a "matter now for the family", Keir Starmer has said.
The Labour leader refused to be drawn into the explosive fallout from the Duke and Duchess of Sussex's interview with Oprah Winfrey, where they alleged that an unnamed royal had made remarks about their son Archie's skin colour before he was born.
The Duke of Cambridge defended the monarchy against accusations of racism on Thursday in his first public appearance since the interview aired.
He said: "We're very much not a racist family."
Buckingham Palace issued a statement on Tuesday saying the allegations were "concerning" and the matter would be dealt with privately.
Mr Starmer was asked if the matter should be dealt with privately or if the outcome should be published at a launch for Labour's local election campaign.
He said: "The issue that Meghan raised of race and mental health are serious.
"The palace has now responded and I do think it is a matter now for the family and I do hope it is resolved as soon as possible.
"But the wider issues in society about race and mental health are something for all of us to take seriously."
Mr Starmer has previously said the allegations needed to be taken "very, very seriously" but stopped short of calling for an investigation.
Prince William said he had yet to speak to his brother about the interview as he made his first public appearance since it aired on a visit to a school in Stratford, east London.
Asked by reporters whether there has been any communication between the brothers, he said: "No, I haven't spoken to him yet, but I will do."
Asked if "the royal family a racist family", he replied: "We're very much not a racist family."
Buckingham Palace has come under intense pressure since the interview, where Meghan claimed questions had been asked about how dark their son Archie's skin might be.
She also alleged that she had been discouraged from seeking mental health treatment, despite feeling suicidal.
