As Iranians protest, why is the US threatening intervention?

Iranians have taken to the streets in nationwide protests against the country's economic crisis. During a police crackdown on protesters, dozens of people have been killed and more have been arrested. US President Donald Trump has warned Iran that if the brutality continues, Iran would be “hit very hard by the United States.” Why is the US threatening intervention?  In this episode:  Narges Bajoghli (@nargesbajoghli), Associate Professor of Middle East Studies, Johns Hopkins University Episode credits: This episode was produced by Chloe K. Li and Melanie Marich, with Phillip Lanos, Spencer Cline, Tamara Khandaker, and our host, Malika Bilal. It was edited by Kylene Kiang.  Our sound designer is Alex Roldan. Our video editors are Hisham Abu Salah and Mohannad al-Melhem. Alexandra Locke is The Take’s executive producer. Ney Alvarez is Al Jazeera’s head of audio. Connect with us: @AJEPodcasts on X, Instagram, Facebook, and YouTube