Speaking at a party convention, the US president gave no details on how the plan would work or where the money would come from.
Iran war won’t end until after crucial November elections, says Trump
The president also said oil prices won’t come down until after the November races, claiming without evidence that Iran wants to impact the election.
Four takeaways from Republican midterms convention
The US president covered many of the subjects he has returned to time and again – with a few surprises thrown in.
Watch: Do Republicans blame Trump for high oil prices?
The BBC’s Sarah Smith is at the Republican Party’s first midterms convention in Texas, taking place as oil prices rise to $100 (£74) a barrel.