Democratic presidential nominee Hillary Clinton called on supporters to vote and volunteer in the final days of the election. Rapper Jay Z closed the concert by performing his 1998 single "Hard Knock Life." (Victoria Walker/The Washington Post)

Democratic presidential nominee Hillary Clinton called on supporters to vote and volunteer in the final days of the election. Rapper Jay Z closed the concert by performing his 1998 single "Hard Knock Life." (Victoria Walker/The Washington Post)

CLEVELAND — Democratic presidential nominee Hillary Clinton capped a long day on the campaign trail Friday by appearing on a concert stage here with both Jay Z and Beyoncé and urging supporters to “take this energy out with you.”

“I want to be a president who helps everybody fulfill their God-given potential,” Clinton told the crowd, saying the election offered a stark choice between the vision of her Republican opponent Donald Trump and the country she wants.

“Will we reject a dark and divisive vision for our future and embrace a hopeful, inclusive, unified America?” Clinton asked.

The concert was the latest staged by the Clinton campaign with the aim of boosting enthusiasm for her presidential bid. It came just four days before the election and as polls show the race is tightening and still volatile.

Jay Z was booked as the headliner at Friday night’s performance, but he also was joined by his wife, who offered an endorsement of Clinton, noting the historic nature of her bid.

Republican presidential nominee Donald Trump took a dig at Democratic rival Hillary Clinton saying that he didn't need to bring artists such as Jennifer Lopez and Jay Z to his campaign rallies. Clinton is expected to campaign with rapper Jay Z in Cleveland Nov. 4. (Victoria Walker/The Washington Post)

“There was a time when a woman’s opinion did not matter,” Beyoncé said. “Look how far we’ve come from having no voice to being on the brink of history.”

Clinton took the stage about two hours after Trump held his final event of the day in Hershey, Pa., where he declared “our country’s gone to hell.”

The GOP nominee pledged to secure the borders, rebuild inner cities and end government corruption during a raucous rally in a Democratic-leaning state he is trying to tip in his direction.

Trump also faced a new controversy Friday night as the Associated Press reported that his wife, Melania, was paid for 10 modeling jobs before she received legal authorization to work in the United States in 1996.

The AP cited detailed ledgers from Melania Trump’s modeling agency, as well as a contract she signed with the firm, concluding the modeling assignments would have been outside the bounds of her visa.

Melania Trump, who became a U.S. citizen in 2006, has always maintained that she arrived in the country legally and never violated the terms of her immigration status.

There was no immediate response from the Trump campaign.

1 of 8 Full Screen Autoplay Close Skip Ad × Eight of the most memorable moments from the 2016 presidential campaign View Photos A look at some of the historic, amusing and cringe-inducing events of the race between Republican nominee Donald Trump and Democratic nominee Hillary Clinton. Caption A look at some of the historic, amusing and cringe-inducing events of the race between Republican nominee Donald Trump and Democratic nominee Hillary Clinton. Entering the race In June of 2015, Donald Trump entered the presidential race with a bang. After arriving to make the announcement on an escalator at Trump Tower, he would go on to make several explosive statements, including calling Mexicans rapists and promising to build a border wall on the U.S.-Mexico border.

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At his Pennsylvania rally, Trump boasted of tightening poll numbers in several battleground states as he laid out his vision for the country, which he said would include fixing “inner cities,” which he said are “so bad.”

“They’re unsafe,” Trump said. “You get shot walking to the store for a loaf of bread. They have no jobs. I say, ‘Give me a chance, I will fix it.’ … It will be a great thing. We have to fix it.”

Trump also knocked Clinton for staging the concert with Jay Z on Friday and for another one last week in Miami with pop star Jennifer Lopez.

“I didn’t have to bring JLo or Jay Z,” Trump told his crowd of more than 10,000 people. “I am here all by myself. Just me. No guitar. No piano. No nothing.”

Trump appeared earlier Friday in Atkinson, N.H., and Wilmington, Ohio, part of a recent string in rural areas, where he is trying to boost turnout by white working-class voters.

Besides reminding supporters of Clinton’s scandals, Trump focused on promises to return lost manufacturing jobs, uplift military veterans and protect residents from what he described as dangerous undocumented immigrants.

“Don’t let the pundits, the politicians or the media tell you what kind of a country you have,” Trump said in Wilmington. “Don’t let them limit your dreams because they want to limit your dreams. You can have any future you want.”

[Clinton up 47-44 in Post-ABC News Tracking Poll, despite Trump’s 9-point edge on dealing with corruption]

Clinton, meanwhile, brought a new urgency to her message at a rally earlier Friday in Pittsburgh, focusing on the danger that she said a Trump presidency would present to the country and asking supporters to imagine Trump taking the oath of office in front of the Capitol and being in charge of the nation’s nuclear arsenal.

“Think about what it would mean to entrust the nuclear codes to someone with a very thin skin who lashes out at anyone who challenges him,” Clinton said. “Imagine how easy it would be that Donald Trump would feel insulted and start a real war, not just a Twitter war at 3 in the morning.”

Later, at a rally in Detroit, Clinton talked about issues including criminal justice reform, college affordability and systemic racism, all of which are of particular importance to black voters. She also criticized Trump for portraying the lives of black people as being “all about crime and poverty and despair.”

Clinton also dispatched her most potent surrogates around the country Friday. President Obama, Vice President Biden and Sen. Bernie Sanders all stumped for Clinton.

In Denver, former president Bill Clinton talked about everything — from his wife’s work on special education to the credit ratings of millennials — assuring around 500 Democrats that they were on track to win.

Obama appeared at a pair of North Carolina rallies, including one Friday night in Charlotte.

“This should not be a close race, but it’s going to be a close race,” Obama said. “It’s going to be especially close in North Carolina. . . . We’ve got to work like our future depends on it, because you know what, our future depends on it.”

[Hillary Clinton’s retro ad strategy: apocalyptic Cold War pitches, updated]

Earlier in Fayetteville, N.C., Obama continued to assert that Trump is “temperamentally unfit” to be commander in chief and has a long track record of insulting minorities, the disabled, women and others.

“If you disrespected women before you were in office, then you will disrespect women once you take office. If you accepted the support of Klan sympathizers, if you don’t denounce them right away because you’re not sure, well that’s what you’re gonna do once you’re in office,” Obama said.

At Clinton’s stop in Pittsburgh, businessman and reality television star Mark Cuban relentlessly needled Trump for potentially not being as wealthy as he claims and for lacking the temperament to be president. Cuban also claimed Trump could be bribed.

“If Donald Trump, who rips off people for thousands, gets offered by some dictator somewhere, some despot somewhere $20 billion, do you think he’s going to do what’s right for the country or do you think he’s going to take the money?” Cuban asked. “Do you think he cares about you or his bank account?”

[At Trump rally, former N.H. governor jokes about the Clintons’ sex life]

Trump’s surrogates continued to create headaches for his campaign. At the New Hampshire rally, former New Hampshire governor John H. Sununu joked that Clinton’s husband does not want to have sex with her.

“Do you think that Bill was referring to Hillary when he said: ‘I did not have sex with that woman?’” Sununu said, referring to former president Bill Clinton.

A small crowd gathered at a country club laughed at the joke. One man shouted: “You mean Bill the rapist?” Trump’s campaign has yet to respond to the comment.

Sununu was governor of the state in the 1980s and was later White House chief of staff under President George H.W. Bush. He is the father of former senator John E. Sununu and Christopher Sununu, who holds a local office and is running for governor.

[A Donald Trump adviser just called Clinton the c-word in a tweet]

While talking about how he plans to win Texas, Trump called the state’s agriculture commissioner, Sid Miller, a “wonderful guy.” Miller called Clinton the c-word in a tweet.

Also on Friday, two former aides to New Jersey Gov. Chris Christie, who is chairing Trump’s transition team, were convicted of all charges related to a plot to create a mammoth traffic jam on the nation’s busiest bridge as political retribution. Three people, including the traffic jam’s admitted mastermind, testified in federal court that Christie knew about it as it was happening. Christie, on Friday, continued to deny he knew about the plan.

[Chris Christie allies convicted in ‘Bridgegate’ trial]

The convictions are a coda to a huge scandal in a state where political misdeeds are as common as the traffic jam that started this one. Known as “Bridgegate,” the scheme hobbled Christie as his national star was rising and imperiled his presidential campaign, which ended in February. Since then his approval rating has nose-dived in New Jersey, where only about 20 percent of residents surveyed believe he is doing a good job.

But all of this has had little impact on Christie’s standing within the Trump campaign, where the governor is tasked with spearheading Trump’s transition to the White House should he win. On Thursday, Christie hosted a $5,000 a person fundraiser for Trump’s transition team at a law firm office in Washington.

[Want to learn about the Trump transition? You’ll have to pay $5,000]

Clinton campaign chair John Podesta said Christie should step down from the campaign.

“Rather than just crisscrossing the country and hop-scotching, talking about cleaning up the swamp, he might start by draining his own swamp and asking Mr. Christie to resign as the head of his transition,” Podesta said of Trump.

At a rally in Ohio, Trump said Clinton should fire Podesta and longtime aide Huma Abedin. The FBI said it found additional emails possibly pertinent to the Clinton investigation on a computer belonging to Abedin’s estranged husband, former congressman Anthony Weiner.

Trump’s campaign, which has said it will pass massive ethics reform, did not return a request for comment.

Meanwhile, a federal judge on Friday ordered elections boards in three North Carolina counties to restore voter registrations canceled through a so-called “individual challenge law” after the state NAACP sued over thousands of the challenges.

U.S. District Judge Loretta Biggs issued the ruling after an emergency hearing earlier in the week on NAACP allegations that at least three counties purged voter rolls through a process disproportionately targeting blacks.

The ruling could affect several thousand voters in the swing state.

Katie Zezima in Washington and David Weigel in Denver contributed to this article. Johnson reported from Hershey, Pa., Atkinson, N.H., and Wilmington, Ohio. Philip reported from Pittsburgh, Detroit and Cleveland. Wagner from Washington.