President Donald Trump has promised every American adult $5,000 if Republicans retain control of Congress in the November midterm elections, calling the proposed payment a “Trump dividend.”

Speaking at the Republican National Midterm Convention in Dallas on Wednesday, Trump urged supporters to vote for Republican candidates despite not being on the ballot himself.

“If the Republicans win, you win with us and you get $5,000.”

Trump did not explain how the payments would be funded. The proposed payout could cost more than $1 trillion if extended to all eligible American adults. He said only that the United States was “making so much money”.

The president also appealed directly to voters to treat the election as if he were contesting it.

“I’m asking you to pretend that I’m on the ballot.”

Trump defends Iran war

Trump used his address to strongly defend the war with Iran, predicting victory and linking its outcome to falling oil prices.

He said food prices and other costs were already declining and claimed oil prices would fall further once the United States wins the conflict.

Trump also warned that a Democratic victory would turn the United States into a “communist country”, while urging voters to keep Republicans in control of Congress.

Opinion polls cited by Channels Television show Trump’s approval rating in the low 30s, amid voter concerns over high prices and the Iran war.

Decision Desk HQ projects that Democrats could win control of the House with 230 seats to Republicans’ 205, while also taking the Senate 51-49.

Republicans rally behind Trump

Despite the difficult political environment, the Republican convention in Dallas had a celebratory atmosphere, with supporters chanting “USA! USA!” and displaying Trump-themed merchandise.

Republicans promoted tax cuts, immigration enforcement, increased manufacturing and lower prescription drug prices as key achievements.

The convention is the first Republican national convention specifically organised for a midterm election. No candidates are being nominated and no formal party business is scheduled.

Instead, the two-night event has been structured largely as a televised rally aimed at promoting Trump’s record and Republican candidates ahead of the November 3 election.