Donald Trump revealed that he "loves racing against mentally weak people" in what could be a preview of how a bitter US election game could look between him and Joe Biden.
After months of strikes from afar, the President and the Democratic candidate of the United States are now both coinciding in the Iowa, a fluctuating state critical to their political future, where one was unleashed independently by the other.
Leaving the White House for the Iowa, Trump dumped Mr. Biden, telling reporters he thought the historic congressman and former vice president under Barack Obama was "a loser" and questioned the his mental fitness.
"I'd rather run against, I think, Biden than anyone else," Trump said. "I think he's the weakest mentally, and I like racing against mentally weak people. I think Joe is the weakest here. The others have a lot more energy."
A few minutes later, Biden used a speech in Iowa to describe Trump as "an existential threat to America" that could radically change the nature of the country and its values.
For Mr Biden, a convincing victory in the caucuses of next year would cement him as a democratic leader and strengthen his main thesis that he is the party's best-placed candidate to beat Mr. Trump. The Republican president, meanwhile, is trying to support his support for Iowa as part of a larger effort to ensure that the 2016 Midwest states stay in his column next year. The battle for the democratic nomination is precocious and fluid, and Mr. Biden has a lot of work to do to maintain command of the Democrats in Iowa and nationally. But the convergence of the two men in a state that has swung between Democrats and Republicans over the past two decades could offer a glimpse of what a Trump-Biden match would look like if the former vice president prevailed in his quest for the nomination.
Dubuque County Democratic Party President Steve Drahozal said "both present are quite a contrast to the voters, so they can listen to two different parties".
Mr. Trump and Mr. Biden have been surrounding themselves for months.
Mr. Trump, despite his councilors' private council, has launched a steady stream of public insults to Mr. Biden. Since March, Trump has mocked or criticized Mr. Biden on Twitter almost 40 times.
In one of his most brazen attacks, during a recent state visit to Japan, Trump echoed the description of North Korean chief Kim Jong-un as "low IQ".
Mr. Biden, in turn, struck Mr. Trump. During a recent fundraiser in Houston, Biden promised not to "go down in the mud that struggles with this guy", only to say later in the same event, "We all know that this guy knows nothing." It is also expected to criticize the president's economic policy as hurting those same voters who helped him elect it.
"He thinks he's tough. Well, it's easy to be tough when someone else feels the pain," says Biden, in the remarks prepared for the Tuesday delivery in the Ottumwa blue collar, the county seat of Wapello.
Trump was the first Republican to lead the economically distressed county in the southeastern Iowa by Dwight Eisenhower.
"How many sleepless nights do you think Trump had compared to what he's doing to American farmers?" He asks Mr. Biden, according to his prepared remarks. "Zero."
For Mr. Trump, the greatest concern in this state dominated by agricultural interests could be trade. He began his trip to Council Bluffs to tour and talk to Southwest Iowa Renewable Energy, which produces and sells the additive for corn-based fuel, before tackling a GOP dinner at the Iowa in Des Moines . It is expected to highlight its efforts to help farmers financially damage Chinese tariffs on US agricultural products, measures that were imposed last year after Trump paid out Chinese import levies.
Trump could also try to sell the farmers on the US-Mexico-Canada trade agreement, which remains ratified by the politicians of each country. Supporters of the agreement, which is an update of the North American Free Trade Agreement, feared that Mr. Trump's recent threat to impose tariffs on Mexico on illegal immigration would compromise the passage of the pact by the US politicians. But Mr. Trump announced an agreement with Mexico at the end of last week and delayed tariffs for the moment. The president, however, has been criticized by the fact that what he announced last Friday was a series of steps that Mexico had already accepted. He came out on Monday with a couple of tweets in which he made fun of a secret deal with Mexico to be announced soon. Mexico replied that no secret agreement was in progress. For his part, Mr. Biden will be in Iowa a few days after more than a dozen of his Democratic rivals were in the state for a dinner party. Several veiled punctures aimed at the former vice president, who frame him as someone unable to bring the country into the future.
The trip arrives after breaking the democratic competition last week, saying it had supported a ban on federal funds in support of abortion. After a protest by women's groups and many other Democratic candidates, he backed off and said he would support the repeal of the Hodde Amendment.
He will begin his journey by campaigning in parts of the southeastern Iowa that were won by Barack Obama, but who later embraced Mr. Trump.
It is wise for Mr. Biden to campaign in the territory won by Trump to reinforce his argument that he is the most suitable democrat to face Mr. Trump, said David Axelrod, a senior Obama strategist.
"He continues to be the person at this juncture that voters think he can beat Trump. It seems the least risky choice," Axelrod said. "But too many episodes like last week and the risk factor will come".
Meanwhile, speaker Nancy Pelosi rejected the impeachment questions on the president, saying "she is not even close" to have sufficient support from the House Democrats for a vote. Ms Pelosi said at a political conference Tuesday that her "stock goes up" when Mr. Trump attacks her.
Mr. Trump lashed out against Pelosi while both were abroad to commemorate the 75th anniversary of D-Day in Normandy. He called it "Nervous Nancy" after it was reported that he privately told Democrats that he would prefer to see him voted off the office and "in jail" rather than impeached.
Ms Pelosi said she never criticizes the president while abroad and will not do so now because he "ended up with him". Dozens of House Democrats want Mrs Pelosi to initiate an impeachment proceeding following the Trump-Russia report, but plans to conduct further investigations.