US President Donald Trump's approval rating has dropped to its lowest level across both his presidential terms, with rising petrol prices and economic concerns weighing on public opinion ahead of the November 3 congressional elections, a Reuters/Ipsos poll showed.
The four-day survey, which closed on Monday, found that 31% of Americans approved of Trump's performance, down one percentage point from two weeks earlier.
Asked which party they would vote for if the congressional elections were held today in what is known as a "generic ballot" question, some 47% of registered voters in the nationwide poll picked Democrats and 35% chose Republicans.
The 12-point Democratic advantage was the widest over the current election cycle and could bolster Democratic hopes of seizing control of the US House of Representatives and the US Senate.
For Republicans, losing control of either chamber could complicate Trump's agenda in the last two years of his term.
Generic ballot polls are national polls that provide an overall view of which party poll respondents want to see in charge in Congress.
While these polls provide a view of national public sentiment, they do not capture all the nuances of the state-by-state and district-by-district contests that determine control of the Senate and House, contests in which Republicans hold some structural advantages.
A Reuters/Ipsos poll two weeks earlier showed Democrats leading Republicans by 7 points, 44% to 37%.
Much of the drop in support for Republican congressional candidates was due to a larger share of women saying they would pick Democrats.
Some 50% of female voters said they would vote Democratic, compared to 32% eyeing Republican candidates. Men also favoured Democrats, but by a smaller margin.
Trump's popularity has suffered since he ordered military strikes on Iran in February alongside US ally Israel.
The war triggered a surge in gasoline prices, hitting household finances. Some 68% of Americans disapprove of Trump's handling of the economy, including 37% of self-identified Republicans.
Voters in the poll picked Democrats over Republicans as the better stewards of the economy, by 40% to 33%.
The survey, which was conducted online, gathered responses from 1,679 US adults, including 1,279 registered voters.
The poll's results had a margin of error of 2 percentage points for all respondents and 3 percentage points for registered voters.
