I think it's good that Trump has threatened to intervene, even if he doesn't actually intend to (who knows with him). The unpredictability of Trump is what makes him scary to other leaders.
In Friday's post on Truth Social, Trump wrote: "If Iran shots [sic] and violently kills peaceful protesters, which is their custom, the United States of America will come to their rescue."
Shortly after Trump's latest social media post, Khamenei adviser Ali Larijani issued a warning of his own.
"Trump should know that US interference in this internal matter would mean destabilising the entire region and destroying America's interests," he wrote.
But for some of the protesters, intervention from the US would be welcome.
"They [security forces] are afraid and they shake to the bones when Mr Trump says something or Mr (Israeli Prime Minister Benjamin) Netanyahu says something," a young woman protesting in Tehran told the BBC's Newshour programme.
Preferring to stay anonymous for her own safety, she said protesters had been asking for US support for years, because the security forces "believe that if Mr Trump says something, he will do [it]", and they "know if anything happens, they would have to take the consequences".
Eight people are reported to have been killed since protests started on Sunday.
www.bbc.co.uk/news/articles/c0q4z33pnnyo