Donald Trump warns Prince Harry will be 'on his own' if he is re-elected

Former US president Donald Trump has issued a threat to Prince Harry, warning that he will be "on his own" if he is re-elected.

Trump is currently the front-runner for the Republican party nomination to contest current US president Joe Biden in the next US election.

Speaking at the Conservative Political Action Conference (CPAC) near Washington DC, the former reality TV star said Harry's behaviour has been "unforgiveable".

"I wouldn't protect him," Trump said, in what is believed to have been a direct reference to Harry's US immigration status, which has become a contentious issue after the publication of his tell-all memoir Spare. 

In the book, the Duke admitted to taking illegal drugs. That confession has prompted a US think tank The Heritage Foundation to claim he should have been precluded from getting legal entry into the States.

The think tank had argued in court last week that the US government should reveal Harry's immigration form and whether he commented on taking drugs or not.

"He betrayed the Queen. That's unforgivable. He would be on his own if it was down to me," Trump said when asked how he would vote on Harry's immigration status.

The twice-impeached former president, who is facing a swathe of criminal charges, also criticised the Biden administration for how it has handled the Sussexes.

"I think they have been too gracious to him after what he has done," said Trump.

It is not the first time Trump has lashed out at the Sussexes.

In May last year, he hit out at Meghan Markle, saying her treatment of Queen Elizabeth was "very disrespectful".

Speaking to Nigel Farage on GB News in the UK, the former Celebrity Apprentice host said Meghan had "no reason to do that" when talking about their relationship before her death in September last year. 

"I think she [Meghan] has been very disrespectful to the Queen. How can you be so disrespectful to the Queen?" Trump said.

"[The Queen] was incredible, for decades and decades she never made a mistake. I cannot think of a mistake she made, she was never controversial. You cannot be disrespectful to her and I think Meghan was very disrespectful to her, very disrespectful."

Neither Meghan nor Harry have commented on Trump's comments.