Donald Trump would "unleash the wrath of God" on Iran if reelected, but Tehran doesn't fear Kamala Harris, a senior expert on the regime has claimed.

Jason Brodsky, policy director of United Against Nuclear Iran, told The U.S. Sun that a Trump victory in the election on November 5 would pose a "very significant challenge" to the Islamic Republic.

Next week's election comes at a critical time in US-Iranian relations, with tensions between Washington and Tehran as high as they've ever been.