WILMINGTON, Del. (AP) Joe Biden is calling the struggle to reopen U.S. schools amid the coronavirus a national emergency and accusing President Donald Trump of turning his back to instead stoke passions about unrest in Americas cities.

The Democratic presidential nominees broadsides came a day ahead of his own trip to Kenosha, Wisconsin, where Biden said he wants to help heal a city reeling from another police shooting of a Black man. The wounding of Jacob Blake and subsequent demonstrations have made the political battleground state a focal point for debate over police and protest violence, as well as the actions of vigilante militias.

Biden assailed Trump for his vilifying of protesters as well as his handling of the pandemic that has killed nearly 190,000 Americans and crippled the national economy, leaving millions out of work, schools straining to deal with students in classrooms or at home and parents struggling to keep up. An American president, Trumps challenger declared, should be able to lead through multiple crises at the same time.

Where is the president? Why isnt he working on this?, Biden asked. We need emergency support funding for our schools and we need it now. Mr. President, that is your job. Thats what you should be focused on getting our kids back to school. Not whipping up fear and division not inciting violence in our streets.

Trump answered almost immediately with his own event in North Carolina, where he continued casting the protests generally as violent mobs here at home that must be met with a strong show of force. These people know one thing: strength, he said. If local leaders would ask for federal muscle, Trump said, Well have it done in one hour.

The opposing events reflected the clear fault lines of the general election campaign. Each man casts the other as a threat to Americans day-to-day security, but Trump uses law and order as his rallying cry while Biden pushes a broad referendum on Trumps competence and thinking.

Biden said Wednesday that hed use existing federal disaster law to direct funding to schools to help them reopen safely, and he urged Trump to get off Twitter and negotiate a deal with Congress on more pandemic aid. He repeated his assertions that a full economic recovery isnt possible with COVID-19 still raging, and that reopening schools safely is a necessary part of both limiting the virus spread and allowing parents to return to work.

Addressing the ongoing unrest over racial injustice and policing, Biden told reporters he believes the Kenosha officer who shot Blake needs to be charged. Biden also called for charges in the death of Breonna Taylor, a Black woman killed in her Louisville, Kentucky, home by police in March.

Biden also called for legal action on citizens whove committed violence as part of civil unrest, a direct answer to Trumps continued assertions that Biden backs violent protests.

The former vice president said he plans to meet in Kenosha with civic and business leaders and law enforcement. Hes already been in contact with Blakes family. Blake remains hospitalized after he was shot seven times in the back by police as he was trying to get into a car while police were trying to arrest him.

Weve got to put things together, bring people together, Biden said, adding that he was not going to tell Kenosha what they have to do but instead would encourage citizens to talk about what has to be done. The president, he said, keeps throwing gasoline on the fire and encouraging people to retreat to their corners.

Trump made his own foray to Kenosha on Tuesday, underscoring his blanket support for law enforcement, while blaming domestic terror for looting and arson thats taken place in the city. The violence included the burning of several buildings and the killing of two protesters by a 17-year-old, who said he went to Kenosha, armed, to help protect businesses. He is now in custody.

Before his remarks Wednesday, Biden and his wife, Jill, a longtime community college professor and former high school teacher, met with public health experts. He emerged saying Trumps inaction on school aid has left a haphazard response nationally.

Biden said he doesnt want to usurp local authorities power to decide whether to reopen with in-person instruction or virtual learning or some combination. But he said the federal government should make local systems financially whole as they incur considerable costs from software for virtual instruction, personal protective equipment and reducing class sizes for social distancing at schools that bring students to campus.

Also ahead of his Wisconsin trip, Bidens campaign launched a $45 million advertising buy for a one-minute ad featuring his condemnations of violence during a speech Monday, along with his assertions that Trump is fomenting the unrest. The ad, which has English and Spanish language versions, is running on national cable networks and in local markets across Arizona, Florida, Michigan, Minnesota, Nevada, North Carolina, Ohio, Pennsylvania, and Wisconsin.

Violence will not bring change. It will only bring destruction, Biden says in the ad. Trump adds fuel to every fire, he says, and shows how weak he is by his failure to call on his own supporters to stop acting as an armed militia.

Its an answer to a consistent charge from Trump and his allies: You wont be safe in Joe Bidens America. Indeed, when in Kenosha, Trump toured a block charred by protesters fire, calling the destruction anti-American and suggesting Bidens election would ensure similar scenes in U.S. cities across the country.

Trumps advisers hope that his stance which includes falsely accusing Biden of wanting to defund the police shifts attention away from the pandemic that has all but crippled the nation during the presidents fourth year in the White House. They also believe the tactics help Trump attract white voters in suburbs and exurbs, key slices of his 2016 coalition. Trump won Wisconsin by less than 23,000 votes out of more than 1.9 million in 2016, the first Republican to win the state since Ronald Reagan in 1984.

Bidens trip Thursday will be the first time since 2012 that a Democratic presidential candidate campaigns in Wisconsin. Hillary Clinton did not campaign in the state after she lost the primary in 2016, one of the reasons often cited for Trumps narrow victory.

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Barrow reported from Atlanta. Associated Press reporters Jonathan Lemire in Washington and Scott Bauer in Madison, Wisconsin, contributed.