Donald Trump has promised to pay every adult American US$5,000 if Republicans retain control of the House and Senate in the November midterm elections.

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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.