TH Caucus coverageMOUNT PLEASANT — President Donald Trump and Democrat Joe Biden assailed each other during overlapping visits to Iowa on Tuesday, previewing what the country might get in next year’s election if Biden becomes his party’s nominee.

Even before he left the White House, Trump unleashed a series of schoolyard taunts, declaring that “Joe Biden is a dummy.” Biden quickly retorted that the president is “an existential threat to this country.”

The back-and-forth laid bare the rising political stakes for each, even with Election Day 2020 still about 17 months away.

“I’d rather run against Biden than anybody,” Trump said. “I think he’s the weakest mentally, and I like running against people that are weak mentally.”

Biden said such behavior is beneath the office of the presidency. He noted that Trump “found time to go after Bette Midler in the middle of the D-Day ceremonies,” referring to the president’s ongoing online feud with the actress.

Biden began the day in Ottumwa, the heart of Wapello County, a meat-packing and agricultural manufacturing center that Trump was the first Republican to carry since Dwight D. Eisenhower.

The former vice president hit Trump on the economy — an issue the president often promotes as his chief strength in a time of low unemployment.

“I hope his presence here will be a clarifying event because Iowa farmers have been crushed by his tariffs toward China,” Biden said. “It’s really easy to be tough when someone else absorbs the pain, farmers and manufacturers.”

For Trump, the biggest concern in this state dominated by agriculture interests is trade. He headed to Council Bluffs and Southwest Iowa Renewable Energy, a facility that produces and sells the corn-based fuel additive ethanol.

“I fought very hard for ethanol,” Trump said, adding that he fought “for the American farmer like no president has fought before.”

He then mocked Biden while chiding former President Barack Obama, saying “America must never again be held hostage to foreign suppliers as we were under the Obama-Biden, Sleepy Joe group.”

“He was someplace in Iowa today,” the president said of the former vice president “and he said my name so many times that people couldn’t stand it.”

Later Tuesday, Trump was addressing an Iowa GOP dinner in Des Moines, the state capital. He’s expected to highlight his efforts to help farmers hurt financially from Chinese tariffs on U.S. agriculture products, measures that were imposed last year after Trump slapped levies on Chinese imports.

Trump also is likely to try to sell farmers on the U.S.-Mexico-Canada trade deal, which remains to be ratified by lawmakers in each country. Supporters of the deal, which is an update to the North American Free Trade Agreement, feared that Trump’s recent threat to impose tariffs on Mexico over illegal immigration would jeopardize the pact’s passage by U.S. lawmakers. But Trump announced an agreement with Mexico late last week and delayed the tariffs for the time being.

The president, however, has been stung by criticism that what he announced Friday resembled steps Mexico had already agreed to take. Trump predicted in Council Bluffs that the U.S. would soon be increasing its corn exports to its southern neighbor: “Mexico’s going to be doing a lot of buying.”

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