Reza Pahlavi, son of Iran's deposed shah, positions himself as an alternative to the regime

In Tehran, some protesters have begun to chant the name of the son of the last shah of Iran. Living in exile in the US for more than four decades, Reza Pahlavi has continued to call for US-backed regime change and has built a growing group of supporters across social media and in the streets. But the pretender to a defunct throne divides many in the opposition, even as he has become a rallying figure for others.