What does the US want from Iran? Tracking one month of Trump’s changing demands

After saying the US would attack if protesters were harmed, the president appears now to be tying the threat of airstrikes to Iran's nuclear programme

Donald Trump has warned that Iran must come to the table to negotiate a deal over its nuclear programme or face the possibility of airstrikes and regime change, capping off a month of bellicose posturing and whiplash inducing u-turns from the US president.

The US president's demands threaten to open a new chapter in America's long and tumultuous relationship with Iran, which in just over a decade has seen rapprochement, broken deals, targeted assassinations and unprecedented airstrikes.