SIOUX CITY, Iowa — President Donald Trump campaigned in Sioux City, Iowa, on Thursday, speaking at a rally in one of the state’s reddest enclaves as he tries to elevate turnout for Rep. Ashley Hinson in the tight battle for Iowa’s open Senate seat.

As Iowa reels from economic turmoil driven by the war with Iran, Trump’s tariffs and market volatility, the president centered his speech on red-meat attacks against Democrats, while occasionally touching on Iowa.

The once-purple state had been reliably red since 2016; Trump has won it three times since. But Rob Sand, the Democratic nominee for governor, has led his Republican rival in every major nonpartisan poll this year. Hinson is neck-and-neck in polls against Josh Turek, the Democratic nominee.…