Clinton questioned the move, saying it "takes more than trying to make up for a year of insults and insinuations by dropping in on our neighbors for a few hours".
Clinton, who will face Trump in the November 8 USA election, has racked up endorsements from a number of prominent Republicans, including Brent Scowcroft, a national security adviser to two Republican presidents and Richard Armitage, a deputy secretary of state under George W. Bush.
Among likely voters, Democrat Clinton leads Republican Trump 45 percent to 42 percent in Wisconsin.
The confused tone of the speech, however, suggests that the Clinton campaign does not know how to counter Trump's visit. "We've never seen two candidates who are this unpopular".
She also slammed Trump for his past suggestion that he may not protect some allies who do not pay their fair share for defense. Just over half said a Clinton presidency would not make much difference to their own personal access, while 37 percent felt the same way about Trump.
During an address to the American Legion in Cincinnati, Ohio, Clinton said global relations are more than a "photo-op" and that it takes more than "dropping in" on a neighbor to develop relationships.
Always making sure to note her role - "I was deeply honored to be part of that small group advising President Obama" - she explained how the Navy Seals took time before destroying their crashed helicopter to get the women and children living on the compound to safety. "That is not how it works", she said.
Democratic presidential candidate Hillary Clinton greets members of the audience after speaking at the American Legion's 98th Annual Convention at the Duke Energy Convention Center in Cincinnati, Ohio, Wednesday, Aug. 31, 2016.
President Obama carried the state by almost 7 points in 2012 and by 13 in 2008.
She painted a picture of a world, and a nation, in far better shape than in 2009 - a far distance from how most Americans view the direction in which the country is heading. "At this time, we have not confirmed that the documents are, in fact, responsive, or whether they are duplicates of materials already provided to the Department by former Secretary Clinton in December 2014".
Clinton´s image has taken a severe beating over the past month.
The Clinton campaign also released a web video on Wednesday that accused Trump of lying about his trip to Mexico and sarcastically called him the "Great Negotiator".
What it means: Clinton's post-convention bump in Wisconsin is gone. Just 35 percent said they thought the real estate mogul would do a good job, in comparison to Clinton's 43 percent. John McCain, a POW, citing his capture during the Vietnam War.
Notice, however, how Trump uses the expression "Obama-Clinton" - an indication he'll continue tying his opponent to her former boss.