Trump says every adult American will get $5,000 if Republicans win midterms

US President Donald Trump says he would offer every adult American a $5,000 (£3,700) payout if Republicans win both chambers of Congress in November's midterm elections – a plan that would cost more than a trillion dollars.

He gave no details on how it would work or be funded – saying only that the money would have to be spent in the US. Vice-President JD Vance has linked the plan to the revenue that Trump has raised from US tariffs on imported goods.

It may be the first time a US president offered such a payout to Americans, in the context of an election year plea to get out and vote.

There are nearly 270 million American adults, meaning a $5,000 payout would cost the US government some $1.3 trillion.

Iran's retaliation has included attacks against US bases and allies in the Gulf – but crucially it has largely closed the Strait of Hormuz, through which about a fifth of the world's oil and liquefied natural gas used to transit.

On Wednesday, the US president warned his supporters that the war would not end until after the midterms and that oil prices would not come down until then.

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Trump's long speech at the Republican convention in Dallas, Texas, touched on the core of the conflict – the impact on Americans' standard of living. His pledge to increase their spending power drew raucous applause in the hall.

The BBC has asked the White House for further clarification on how Trump's plan would work.

"It is an extraordinary promise, and I'm not sure where that money is going to come from – but it is campaign season," Robert Moran told the BBC World Service's Newsday programme.