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U.S. health officials are to warn lawmakers of the potential for a ‘tremendous burden’ on hospitals.

Four of the top health officials leading the Trump administration’s virus response will testify before a key House committee on Tuesday about efforts to test for, trace and treat the coronavirus, the first time they will appear together in more than a month to brief Congress on the pandemic.

Dr. Anthony S. Fauci, the nation’s top infectious disease expert, and Dr. Robert R. Redfield, the director of the Centers for Disease Control and Prevention, will speak and field questions in front of the House Energy and Commerce Committee. They are likely to be asked about whether they agree with President Trump, who last week claimed in an interview with Fox News that the virus would simply “fade away.”

The doctors will also probably be grilled on the federal government’s progress in developing a vaccine and about the administration’s handling of sharp upticks of the virus around the country. Mr. Trump said at a campaign rally on Saturday in Tulsa, Okla., that he had asked “my people” to “slow the testing down” because increased screening was revealing more infections, making the country look bad.

In a prepared statement provided to the committee ahead of the hearing, the C.D.C. wrote that “Covid-19 activity will likely continue for some time,” potentially careening into flu season and straining hospitals already nearing capacity.

“This could place a tremendous burden on the health care system related to bed occupancy, laboratory testing needs, personal protective equipment and health care worker safety,” the agency wrote.

The New York Times will provide live video of the hearing, which is to begin at 11 a.m. Eastern. Adm. Brett P. Giroir, once the administration’s testing “czar,” and Dr. Stephen M. Hahn, the commissioner of the Food and Drug Administration, are also scheduled to appear.

Dr. Fauci, Dr. Redfield and Admiral Giroir have implored states to test widely for the virus, which allows local health departments and contact tracers to identify new cases quickly and work to stem outbreaks in badly affected areas. In some states with recent significant rises in cases, residents have reported bottlenecks at screening sites, and hospital systems have said that they do not have enough machines to run tests.

The hearing comes as the United States accounted for 20 percent of all the new cases worldwide on Sunday, according to New York Times data.

In one sign of the Trump administration’s eagerness to move on, Admiral Giroir quietly told his colleagues this month that he was returning to his old job as assistant secretary of health to focus on a wide range of public health matters, including childhood vaccination, the opioid epidemic and AIDS.

All four witnesses are part of the coronavirus task force, a dwindling panel of health officials that meets twice a week in the White House Situation Room, one of the few remaining visible elements of the administration’s coronavirus response efforts.

The move is expected to be formally announced on Tuesday. The Detroit Free Press first reported that Michigan would withdraw from hosting the debate.

The debate is set to become the second major presidential campaign event to move to Florida after officials elsewhere raised concerns about large gatherings during the pandemic.

After officials in North Carolina, including Gov. Roy Cooper, a Democrat, sought assurances that delegates would adhere to social distancing at the Republican National Convention in Charlotte, the Trump campaign announced that Mr. Trump would instead accept the G.O.P. nomination in Jacksonville, Fla.

In other news from around the United States:

  • President Trump temporarily suspended work visas and barred more than half a million foreigners from coming to work in the United States, part of a broad effort by the administration to significantly limit entry into the country during the economic downturn caused by the pandemic.

  • After months of lockdown in which outbreaks were often centered on nursing homes, prisons and meatpacking plants, new clusters have been found in bars, churches and other places where people gather. New known virus cases were on the rise in 23 states on Monday as the outlook worsened across much of the nation’s South and West.

  • Gov. Greg Abbott of Texas said on Monday that the virus was spreading in the state at “an unacceptable rate” and that tougher restrictions could be necessary, although he did not specify what those measures would be. “Closing down Texas again will always be the last option,” he said.

  • Black people have been hospitalized for Covid-19 four times more than white people, new data released on Monday by the Centers for Medicare and Medicaid Services found. The data reinforced the many public accounts of the disparities in access to health care and treatment outcomes faced by African-Americans during the pandemic.

  • A moratorium on evictions that New York State imposed during the pandemic expired over the weekend, raising fears that tens of thousands of residents would be called into housing courts, which reopened on Monday.

  • Kentucky, New York and Virginia are holding primary elections on Tuesday. The number of voters casting absentee ballots has risen sharply because of the pandemic, and the results of key races may not be known on Tuesday night as a result. Here’s what to watch for.

  • The White House began easing restrictions on Monday, the same day that the District of Columbia allowed churches, gyms, restaurants and “nonessential” stores to reopen with limited capacity.

  • After months of failed negotiations, Major League Baseball announced that it would impose a 2020 schedule and that it wanted players to report to their home ballparks by July 1 for training camp. If they do — and if the union signs off on health protocols — the schedule would be for 60 games, most likely starting July 24.

Global roundup

A German district tightens its lockdown after an outbreak at a slaughterhouse.

Germany’s biggest pork processing plant, which is owned by the Tönnies company and is in the northwest of the country, has registered 1,550 new coronavirus infections since early last week, leading to the biggest regional outbreak since the nation reopened in May.

On Tuesday, Armin Laschet, the state governor of North Rhein-Westphalia, announced a temporary lockdown of Gütersloh, the district that includes the plant.

Officials had already closed schools and day care centers in the district of roughly 370,000 people. But Mr. Laschet’s emergency plans will focus on enforcing quarantine for the plant’s 7,000 workers as well as community members who are infected.

He also announced that health officials would test residents of nursing homes. Bars, gyms and cultural events — which had only recently reopened — are closed again until at least June 30.

Speaking to reporters, Mr. Laschet characterized the lockdown as a precautionary move and promised to ease the measures as soon as the authorities were sure that the illness would not spread significantly from the plant.

The outbreak has caused Germany’s reproduction number to rise significantly, to a value of 2.9 on Sunday. That means that one person with the disease is expected to infect, on average, 2.9 others. The number had been below one just a few days before.

Since then, the number of daily new infections has fallen. On Monday, the national health authority registered 503 cases across the country.

In other news from around the world:

Sweden’s lax approach to the outbreak alarms its neighbors.

Reporting was contributed by Jes Aznar, Hannah Beech, Stephen Castle, Julie Creswell, Reid J. Epstein, Thomas Erdbrink, Luis Ferré-Sadurní, Matthew Haag, Ben Hubbard, Mike Ives, Miriam Jordan, Annie Karni, Tyler Kepner, Mark Landler, Jonathan Martin, Sarah Mervosh, Elian Peltier, Christopher F. Schuetze, Michael D. Shear, Natasha Singer, Mitch Smith, Matt Stevens, Lucy Tompkins, Hisako Ueno, Noah Weiland and Elaine Yu.