Four weeks or forever: How long will Trump’s war in Iran last?

Since Donald Trump’s decision to join Israel in a war on Iran, the world has been asking “why?” and “what’s the plan?” But does the US president have one, and does the American public have the appetite for a war that could continue indefinitely? The Guardian’s Washington bureau chief David Smith speaks to Reged Ahmad about how long this all could go on for and what’s really motivating Donald Trump.