Only 22 percent of US voters back the president’s performance on the cost of living, Reuters/Ipsos survey suggests.

United States President Donald Trump’s approval rating has dropped to its lowest point since he returned to the White House, sinking to 34 percent amid economic uncertainty and the US-Israel war on Iran, a Reuters/Ipsos poll suggests.

The poll, released on Tuesday, also showed that only 22 percent of respondents back Trump’s performance on the cost of living. Affordability has been a top issue for US voters.

The Iran war, which saw Tehran block most shipping through the Strait of Hormuz, has sent energy prices soaring across the world and fuelled inflation in the US.

The Reuters poll was conducted April 24-27, and it surveyed 1,014 US adults.

It comes months before the midterm elections in November when Trump’s Republican Party will have to contend with the US president’s abysmal job approval ratings as it tries to retain control of the Senate and House of Representatives.

Trump continues to enjoy near-unanimous support from Republicans in Congress despite growing criticism of the war on Iran by some right-wing commentators and podcasters.

The conflict has also been unpopular with US voters, including a sizeable Republican constituency.

A Marquette Law School survey released last week suggested that only 32 percent of voters approve of Trump’s handling of the war.

The number rose to 65 percent among Republican respondents, but it still showed significant dissent within the party on the issue.

A separate Associated Press-NORC poll last week reported similar findings – Trump’s overall approval rating at 33 percent, support for the war at 32 percent and his handling of the economy at 30 percent.

The US and Iran reached a two-week ceasefire on April 8 that Trump extended indefinitely, but tensions remain high in the region.

Duelling blockades in the Gulf – Iran shutting down the Strait of Hormuz and the US laying a naval siege on Iranian ports – have caused global energy supply issues to persist despite the truce.

In the US, the average price of 1 gallon (3.8 litres) of petrol is currently at $4.17, up from less than $3 before the war.

Still, Trump has suggested that he is comfortable with the status quo, claiming repeatedly that the Iranian economy is crumbling and that time is on his side.

“Iran has just informed us that they are in a ‘State of Collapse,’” the US president wrote in a social media post on Tuesday.

“They want us to ‘Open the Hormuz Strait,’ as soon as possible, as they try to figure out their leadership situation (Which I believe they will be able to do!)”

It’s not clear how or why Iran, which is currently refusing to hold direct negotiations with the US without it lifting the naval blockade, would inform Trump that its own economy is collapsing.