DeVos added on “Fox News Sunday” that the Trump administration was looking at “all the options” for pulling federal funding from schools that don’t open in the fall. “American investment in education is a promise to students and their families,” she said. “If schools aren’t going to reopen … they shouldn’t get the funds.”

Her remarks drew swift criticism from House Speaker Nancy Pelosi (D-Calif.), while the government health official in charge of testing signaled that the virus was still spreading too quickly to allow children to return to classrooms.

Here are some significant developments:

• President Trump on Saturday wore a mask in public for the first time, while visiting wounded service members and health-care workers at Walter Reed National Military Medical Center. Trump has previously shown disdain toward face coverings amid the coronavirus pandemic and refused to wear them.
• Louisiana’s Democratic governor announced a new requirement that most people wear a mask in public. The state’s Republican lawmakers have opposed coronavirus restrictions.
• Walt Disney World in Orlando reopened after having been shuttered for nearly four months, even as Florida continued to report record infections. Testing supplies in the state are running low, and some big labs are taking several days to return results, Gov. Ron DeSantis (R) said at a news conference. He partly attributed the backlog to testing many asymptomatic people.

The reopening of schools has emerged as the latest fault line in the country’s faltering pandemic response, with Trump and DeVos pressing the case that a return to normal academic life is in students’ best interests. Trump last week attacked school reopening guidelines from the Centers for Disease Control and Prevention as expensive and impractical, and DeVos said it was imperative that schools resume five-day-a-week classroom instruction.

Many school districts have been quick to push back, with some saying they were concerned about health risks to students and staff, proposing instead hybrid models using at-home and in-school teaching. Major questions remain about the role children and teenagers play in spreading the virus, which health experts say travels quickly in crowded indoor spaces.

Pelosi called DeVos’s message “malfeasance and dereliction of duty” and accused the Trump administration of “messing with the health of our children” in an interview with CNN on Sunday.

Pelosi called on Trump to invoke the Defense Production Act to make sure schools and others have more access to personal protective equipment as the school year approaches. She also said the CDC should take the lead in mandating health guidelines, rather than just offering guidance.

“They should be mandates, not requirements,” Pelosi said of CDC’s rules for schools.

In Miami-Dade County, Fla., Schools Superintendent Alberto Carvalho said students could return to classrooms six weeks from now if people adhered to restrictions such as wearing masks and practicing social distancing. But the decision would require buy-in from the community and must be dictated by science, he said.

“We need the science to drive the practice rather than politics influencing what is legitimately a community concern,” Carvalho told NBC’s “Meet the Press,” adding that in recent months the positivity rate in the county had gone from 6 percent to 29.1 percent.

Houston Mayor Sylvester Turner (D) said it was too early to debate school reopenings, with infections soaring in the city and state.

“It makes no sense to be having this conversation while this virus is out of control,” Turner told KHOU. “You don’t send kids back to school when there’s a raging fire and the fire’s still burning in August.”

New coronavirus cases reached record highs in states across the country on Saturday, even as weekly testing plateaued nationwide.

Nine states in nearly every major region of the country reported record new single-day caseloads on Saturday: South Carolina, Texas, Alaska, Arkansas, North Carolina, Idaho, Wisconsin, Oregon and Hawaii. Six of those states, along with 10 others, registered new seven-day average case highs, according to tracking by The Washington Post.

Saturday also marked the first time since the beginning of the pandemic that multiple states reported more than 10,000 cases in a day, with Texas tallying a record 10,351 and Florida reporting 10,360.

In total, there were 62,715 new infections on Saturday, an increase of 11,564 from the same day last week. The single-day death toll was 724, compared with 289 a week ago.

Seven-day averages for new coronavirus-related deaths reached record levels in Arizona, California, Florida, South Carolina, Tennessee and Texas, according to The Post’s analysis. And average daily deaths were up more at least 40 percent in more than a third of U.S. states.

Testing, meanwhile, has tapered off nationwide, a sign that the surge in infections was the result of the virus’s accelerating spread in many places. About 4.6 million diagnostic tests were administered in the United States last week, compared with about 4.5 million the previous week, after a steady increase in the number since the spring, according to the Covid Tracking Project.

Adm. Brett Giroir, an assistant health and human services secretary who is the government’s coronavirus testing coordinator, said Sunday that face masks were essential for slowing the virus spread but stopped short of calling for a national mandate.

“For this to work, we have to have, like, 90 percent of people wearing a mask in public, in the hot spot areas,” Giroir told ABC News’s “This Week.” “If we don’t have that, we will not get control of the virus.”

Giroir also pushed back against Trump’s criticism of the CDC’s guidance for schools, telling host George Stephanopoulos, “I think the CDC guidelines are really right on target.”

“When we get the virus more under control,” he said, “then we can really think about how we put children back in the classroom.”

He painted a dim picture of what’s to come in the months ahead, saying that he expects the number of hospitalizations and deaths to rise. He said the country would need “tens of millions of more tests a month” as seasonal respiratory infections return in the fall.

“We were hopeful that it would diminish in the summer, but we didn’t count on it,” Giroir said. “And, yes, there’s a possibility it could be worse in the fall, and we are all continuing to increase everything we do.”

Renae Merle contributed to this report.