As the US-Israeli strikes on Iran continue and the death toll continues to rise, so too does the war of words.

President Trump has described Mojtaba Khamenei, Iran's choice for new supreme leader, as "unacceptable". He has also said he believes the war will be over “pretty quickly”, but it’s not clear how - or when.

Nate Swanson, a former State Department official who spent nearly two decades in the US government working on American policy towards Iran, answers our questions on how the next stage of the conflict is likely to unfold - and whether a negotiated peace with Iran is still an option.

Producers: Chris Benderev, Cat Farnsworth and Valerio Esposito

Executive producer: Bridget Harney

Studio managers: James Piper and Mike Regaard.

Mix: Travis Evans

Senior news editor: China Collins

Photo: People walk past a banner depicting the Iran's supreme leaders since 1979. The late supreme leader Ayatollah Ruhollah Khomeini; the late supreme leader Ayatollah Ali Khamenei; and his son, the new supreme leader Mojtaba Khamenei. Credit: Majid Asgaripour/WANA via Reuters.