Trump wants to reduce the cost of fuel as the midterms loom - will it work?

Prices for gasoline and diesel have more than doubled since the US-Israel conflict with Iran began in February, affecting transport businesses, farmers and anyone who drives a vehicle in America.

Ahead of the critical midterm elections, there have been growing calls for more to be done to reduce the price of fuel, and US President Donald Trump has made several comments and announcements aimed at getting costs down.

The question is: what is he able to do with just a few weeks to go before election day - and will it work?