There's speculation that US President Donald Trump is about to launch a major bombing campaign against Iran. 

US aircraft have been moving towards the Middle East, and a Washington DC source has told international media there's a 90 percent chance of war in coming weeks.

Waikato University's Al Gillespie says it's entirely possible, given Donald Trump's desire to show strength.

But he says it could have major consequences. 

"Everyone's thinking Venezuela - like, you cut the head off the snake, but here, it's a very big snake. If you removed the Ayatollah, you're likely to have problems with the Revolutionary Guard."

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