The president, however, put forth his trade policies as reasons to support him.
“What we’ve done with China, what we’ve done with the U.S.M.C.A., what we’ve done with Japan,” he said. “You’ve got to love Trump. You’ve got to love Trump.”
Meantime, Democrats signaled that they would invest heavily to win back the state.
“Wisconsin is going to be one of the states that decides this election, and we’re investing in the state accordingly,” said Cassidy Geoghegan, the Wisconsin outreach director for Priorities USA. She said that health care costs in the state were on the rise and that “farmers are having to sell their cows and close down their operations,” while wages were not keeping up.
During the rally — which started before the Democrats took the stage for their debate in Des Moines — Mr. Trump also singled out Vice President Joseph R. Biden Jr., mocking him for not knowing what state he was campaigning in. “When you do that, you can’t really recover,” the president. “You can be Winston Churchill. But you get killed. He does that every time.”
In reality, Mr. Trump has also suffered his share of confusion about his speaking locations or where tragedies have occurred under his watch. In a somber, televised speech in August after two mass shootings, for instance, Mr. Trump blessed “the memory of those who perished in Toledo,” referring to a city more than 100 miles away from Dayton, the scene of an Ohio massacre.
Mr. Trump’s rally was the centerpiece of a two-day push in Wisconsin, with top Trump aides and family members making stops at smaller venues around the state.
Jared Kushner, the president’s son-in-law and a senior adviser, flew commercial with Senator Ron Johnson, Republican of Wisconsin, to Milwaukee from Washington on Tuesday morning to lead a discussion about prisoner re-entry programs.
Lara Trump, who is married to Eric Trump, the president’s second eldest son, visited Rib Mountain on Monday to speak to voters. And Vice President Mike Pence made an unannounced visit to a Culver’s restaurant in Milwaukee to talk to voters in the kind of small, intimate venue that Mr. Trump does not often frequent himself.