On a sunny day, on a crowded urban street, a heavy van leaps suddenly onto the sideway. It accelerates. It kills and injures dozens. Or an improvised bomb explodes on public transport, injuring many. A perpetrator, apprehended quickly due to CCTV footage, professes allegiance to Isis but claims to have acted alone.
A version of this awful scene was replayed in Barcelona and just days ago in London – but what if it were to happen in the US? How would its government respond?
One way of making a prediction is by looking at the Trump administration’s responses to other dramatic threats.
Read more at The Guardian