Donald Trump has warned that Prince Harry will be “on his own” if he wins a second term as US president this year, saying the Duke of Sussex “betrayed the Queen”.

Speaking at at the Conservative Political Action Conference in Washington on the weekend, Trump said the current US government had been “too gracious” to Harry since he and Megan Markle moved to California in 2020.

“I wouldn’t protect him. He betrayed the Queen. That’s unforgivable,” the former US president to the US Daily Express at the conference.

“He would be on his own if it was down to me,” he added.

Trump’s comments come just days after Harry told the Good Morning America television show that he was considering becoming a US citizen.

“American citizenship is a thought that has crossed my mind, but certainly is not something that is a high priority for me right now,” he said in the interview.

The Sussexes announced the birth of their daughter Lilibet in 2021 and in a statement said the name was in reference to the Queen’s family nickname.

A recently-released autobiography by royal journalist Robert Hardman said the Queen was “as angry as I’d ever seen her”, despite the couple saying she had been supportive of the name.

The BBC quoted a palace source after the announcement as saying that the Queen “was not asked by the Duke and Duchess of Sussex about naming their daughter Lilibet”.

Harry’s status in the US, meanwhile, has been questioned by US conservative think tank The Heritage Foundation.

The Duke of Sussex admitted to previously taking cocaine, marijuana and psychedelic mushrooms in his his 2023 memoir, Spare.

The Heritage Foundation in a recent lawsuit argues that Harry cannot have legally entered the America because US law “generally renders such a person inadmissible for entry”.