Welcome to The World in 10.
In an increasingly uncertain world, this is The Times' daily podcast dedicated to global security.
I'm Toby Gillis, joined by Stuart Willey.
Donald Trump's messaging to Iran is increasingly hostile.
Some believe that his claims that Iran may feel the full might of the US military might not merely be posturing.
On Monday,
reports suggested the aircraft carrier USS Nimitz was heading from the South China Sea to the Middle East,
while Mr Trump took to social media to tell the population of Tehran to evacuate from the city.
But what would an American assault on Iran look like?
Elizabeth Braw is a senior fellow with the Atlantic Council's Transatlantic Security Initiative.
Elizabeth,
how likely do you believe Donald Trump is to use the military to bring an end to Iran's nuclear problem,
as he puts it?
It will require a lot of military force to end Iran's nuclear program.
And the question is whose military force it will require.
Israel or the United States as well.
And if it's going to require the United States military,
then we are talking about a completely new dimension of this conflict.
An armed conflict between the United States and Iran is very different than an armed conflict between Israel and Iran.
So that seems unlikely.