Iran and Saudi Arabia have upped the ante in their war of words. Both are now denouncing the other's Islamic legitimacy. The two Persian Gulf powers are already locked in numerous proxy conflicts across the region. The US is not happy about the mess.
"You're not going to separate us," Muslim bus-riders told Islamic militants who demanded the Muslims and Christians separate. The Muslims told the militants to kill us all, but we will not sacrifice our Christian colleagues.
In the months after 9/11, the US government set up a system to register and interview men from Muslim-majority countries in an effort to combat terrorism. It was quietly shelved after a few years mostly because it didn't work. Trump’s advisors want to bring it back.