Under the proposal, the payment would be limited to U.S. citizens and would have to be spent within the United States.

US President Donald Trump has promised a $5,000 payment to every adult American if Republicans win control of both chambers of Congress in November’s midterm elections.

The US president's US$1.35 trillion pledge raises a number of questions, and he has not specified where the money would come from.

With approximately 270 million US adults, the idea would cost around US$1.35 trillion.

Donald Trump proposes a $5,000 dividend for every US adult if Republicans retain Congress, with the money required to be spent in the US.