Milwaukee, Wisconsin - Donald Trump and Kamala Harris hold dueling campaign rallies Friday in Wisconsin's largest city of Milwaukee, as both candidates make frantic last-ditch appeals to voters with Election Day just around the corner.

Republican Trump will return to the venue where he was crowned his party's presidential nominee over the summer, his ear bandaged in bright white gauze after he was wounded in an attempted assassination just days earlier, while Democrat Harris will lean on the star power of rapper Cardi B to outshine her rival.

Their race back to the so-called Blue Wall states came after the pair spent Thursday in the West, with three appearances each.

The highlight for Harris had been a star-studded rally in Las Vegas where she was introduced by pop maven Jennifer Lopez.

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Meanwhile, Trump spent a comfortable evening basking in mutual affection with right-wing provocateur Tucker Carlson in Glendale, Arizona.

With Tuesday's vote looming, the candidates appear set for a photo finish, despite fierce efforts by the rival campaigns to move the dial and dominate the news cycle in a week so far defined by bitter disputes over issues including race, gender, and reproductive rights.

Wisconsin, one of the key battleground states that will swing the November 5 election, was decided by less than one percentage point in 2016 and 2020, and the race for its 10 electoral college votes is just as tight this time around.

Harris was seeking to harness the power of musicians such as GloRilla, the Isley Brothers, and Flo Milli at a "When We Vote We Win" rally and concert in Milwaukee. Grammy award-winning rapper Cardi B was due to speak at the event, Harris' campaign said.

Trump was returning to the Fiserv Forum, the venue that hosted perhaps the high-water mark of his campaign, the Republican National Convention.

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The convention came as the tycoon was riding high in the polls after two major events – the assassination attempt and a debate with then-candidate Joe Biden which proved disastrous for the Democrat – but before Biden dropped out of the race and handed the baton to Harris.

Lifted by a surge of enthusiasm, Harris quickly ate away at Trump's lead – but the polls have remained mostly deadlocked ever since. The Democrat has seen her support dwindle among Muslim and Arab-American voters and allies over her continued backing of Israel over a year into the genocide in Gaza.

With fears growing that Trump could refuse to accept the result if he loses the election, many Americans were bracing for violence and unrest in the days after November 5.

Washington's police chief Pamela Smith told a press briefing this week that no "credible threats" had been identified against the capital, which saw a deadly riot by Trump supporters seeking to overturn Biden's election win on January 6, 2021.

Smith said that officials were remaining "vigilant." Police would support peaceful protests, she said, but "we will not tolerate any violence of any kind."

"We will not tolerate any riots, we will not tolerate the destruction of property, we will not tolerate any unlawful behavior," she said.

Some 63.5 million people have cast their ballots early, more than 40% of the 2020 total vote.