Iran’s Supreme Leader vowed vengeance Saturday after his father’s funeral, which was marked by chants calling for the death of U.S. President Donald Trump. Experts assess the credibility of the threat.

Placards were held up saying ‘Kill Trump’

By Parisa Hafezi and Angus McDowallDUBAI, July 9 (Reuters) - The funeral procession of Iran's slain Supreme Leader Ayatollah Ali Khamenei approached the country's holiest shrine…