Donald Trump's approval rating has fallen to a record low, according to multiple polls, as midterm elections set for November 3 draw closer and could determine control of the House and Senate.

A Reuters/Ipsos poll found Trump's approval rating at 31 percent, the lowest of his political career. A separate Washington Post/ABC/Ipsos poll placed the figure slightly higher, at 33 percent. Both figures represent record lows.

The Reuters/Ipsos poll also found Trump's Republican Party at a significant disadvantage. When asked whether they would vote for a generic Democrat or a generic Republican in congressional races, respondents favoured Democrats by 12 points.

The percentage of Americans who disapprove of Trump has grown steadily in recent months, particularly since the February 28 launch of the US-Israel war on Iran, which has driven up petrol and diesel prices and had knock-on effects across the economy.

An NBC poll released Sunday found 71 percent of Americans said the country was on the "wrong track." The same poll found 55 percent would vote for the Democratic Party if an election were held that day.

The Washington Post/ABC/Ipsos poll, also released Monday, found that 7 out of 10 Americans said petrol or gasoline was becoming unaffordable.

Several recent polls have documented the growing difficulties facing Trump and his party ahead of the November midterms.