United States President Donald Trump has warned that the US could return to military action if he is not satisfied with a proposed agreement with Iran.

Speaking at the G7 summit in Evian-les-Bains, France, on Wednesday, Trump said the memorandum of understanding (MoU) was not final.

He said if he didn't like it or if Iran didn't behave, we'll go right back to dropping bombs right smack in the middle of their head.

We'll go back to shooting at them, dropping bombs on their heads.

I don't like it if they don't behave.