President Donald Trump said on Wednesday he would pay every American adult a $5,000 US "Trump dividend" if Republicans retain control of Congress in November's midterm election, an extraordinary attempt to persuade voters to back his party.

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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.

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.