Trump says Americans could receive $5,000 if Republicans win Congress. Here’s what is known about his proposed ‘dividend’.

President Donald Trump on Wednesday promised $5,000 to every American adult if Republicans retain control of Congress in November, coupling the extraordinary claim with a plea for his supporters to "pretend" he was on the ballot.

"If the Republicans win, you win with us, and you get $5,000. It will be called the Trump dividend," he told the Republican midterm convention in Dallas, as the party struggles in polls against the Democrats.

The president did not disclose where the money would come from -- with the theoretical bill likely topping $1 trillion -- saying only that "our country is making so much money."

Doubling down on his bet that he can help Republicans defy opinion polls and retain both houses of Congress on November 3, Trump said: "I'm asking you to pretend that I'm on the ballot."