Americans vote on Tuesday 3 November in the midterm elections. The results will decide who controls the House and the Senate, the two parts of Congress, for the last two years of President Trump's term.
On Monday, Mr Trump gave a nearly hourlong closing speech at the Lincoln Memorial Reflecting Pool. He said Tuesday's elections could be the most important midterms in his lifetime. He admitted that sitting presidents usually lose midterms.
Prices are a big reason why. The U.S.-Iran war is in its ninth month, and rising gas prices have been a major issue. The Associated Press says high gas prices, grocery costs and inflation have made things harder for Republicans. Democrats could win at least one chamber, which would give them subpoena power.