For almost two weeks, Donald Trump has seemed on the verge of intervening in Iran.
From his 2 January threat to come to the "rescue" of protesters if the Iranian authorities used violence against them, to his promise this week that "help is on its way," the US president has sounded resolute.
On Tuesday, a CBS journalist covering the president's visit to Detroit asked how Mr Trump would respond if the Iranian authorities started to execute detainees.
Iranian activists said the family of Erfan Soltani had been told the 26-year old shopkeeper had been sentenced to death for participating in the protests.
"If they do such a thing, we will take very strong action," the president replied, saying his endgame in Iran was "to win".
