President Donald Trump called on Arizona to "win those midterms" in an April 17 appearance at a Turning Point USA event.

The "Build the Red Wall" event was part of the conservative organizing group's initiative to bolster support for Republicans in Arizona, New Hampshire and Nevada.

But Trump's approval rating has long been underwater, with some polls showing new lows as the war in Iran has been going on for nearly two months. The U.S. and Iran have continued to quarrel over the Strait of Hormuz, a chokepoint for about a fifth of the world's oil, that has been largely closed since the war started. AAA gas price data shows the national average for a gallon of regular gas is over $4, compared to $2.98 when the war started.

The midterms are usually seen as a referendum on the presidency, so what do voters think of Trump's job performance? See the latest polls:

More: Young voters shun Trump, plan to vote blue in midterms, poll says