US President Donald Trump has pledged to give all American adults $US5000 if Republicans win at the crucial midterm elections, but there is a catch.

Vance appears to try to partially walk back questionable proposal, but suggests it could be paid for with tariff revenues, despite estimated cost amounting to more than $1 trillion

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.