The entrance to Public School 159 is seen in the Queens borough of New York City, New York, U.S., July 8, 2020.

School supplies lie piled up during summer break renovations and installation of social distancing measures at St. Joseph's School, amid the outbreak of the coronavirus disease (COVID-19), in La Puente, near Los Angeles, California, U.S., July 14, 2020.

Fifth-grade teacher Danielle Biggs writes a message against the reopening of schools while other Florida teachers, whose unions are against their members returning to school, hold a car parade protest in front of the Pasco County School district office in Land O' Lakes, Florida, U.S. July 21, 2020.

An aerial image of some dozens of empty school buses is seen in a parking lot amid the global outbreak of the coronavirus disease (COVID-19) in Houston, Texas, U.S., July 8, 2020.

Social distancing dividers for students are seen in a classroom at St. Benedict School, amid the outbreak of the coronavirus disease (COVID-19), in Montebello, near Los Angeles, California, U.S., July 14, 2020.

A girls' restroom is seen during summer break renovations and installation of social distancing measures at St. Joseph's School, amid the outbreak of the coronavirus disease (COVID-19), in La Puente, near Los Angeles, California, U.S., July 14, 2020.

Administrative assistant Marie Delvalle sits behind a glass panel installed in the main office to prevent the spread of the coronavirus disease (COVID-19) at Mantua Elementary School in Fairfax, Virginia, U.S., July 17, 2020.

A general view of Charles Rushe Middle School, where teachers, whose unions are against their members returning to school, will hold a car parade protest in front of the Pasco County School district office in Land O' Lakes, in Pasco County, Florida, U.S., July 21, 2020.

A message written on a car window is pictured as Florida teachers, whose unions are against their members returning to school, hold a car parade protest in front of the Pasco County School district office in Land O' Lakes, Florida, U.S. July 21, 2020.

A covered water fountain is seen during summer break renovations and installation of social distancing measures at St. Joseph's School, amid the outbreak of the coronavirus disease (COVID-19), in La Puente, near Los Angeles, California, U.S., July 14, 2020.

A sign of health safety measures to prevent the spread of the coronavirus disease (COVID-19) is seen on the door to the main office at Mantua Elementary School in Fairfax, Virginia, U.S., July 17, 2020.

Social distancing dividers for students are seen in a classroom at St. Benedict School, amid the outbreak of the coronavirus disease (COVID-19), in Montebello, near Los Angeles, California, U.S., July 14, 2020.

Florida teachers, whose unions are against their members returning to school, hold a car parade protest in front of the Pasco County School district office in Land O' Lakes, Florida, U.S. July 21, 2020.

School supplies lie piled up during summer break renovations and installation of social distancing measures at St. Joseph's School, amid the outbreak of the coronavirus disease (COVID-19), in La Puente, near Los Angeles, California, U.S., July 14, 2020.

A school sign is seen during summer break renovations and installation of social distancing measures at St. Joseph's School, amid the outbreak of the coronavirus disease (COVID-19), in La Puente, near Los Angeles, California, U.S., July 14, 2020.

New ceiling fans to increase classroom air flow are seen during summer break renovations and installation of social distancing measures at St. Joseph's School, amid the outbreak of the coronavirus disease (COVID-19), in La Puente, near Los Angeles, California, U.S., July 14, 2020.

Fairfax County Public Schools assistant director of facilities management Todd Jones stands in a classroom where desks have been spaced to prevent the spread of the coronavirus disease (COVID-19) at Mantua Elementary School in Fairfax, Virginia, U.S., July 17, 2020.

Fifth-grade teacher Johora Warren writes a message against the reopening of schools while other Florida teachers, whose unions are against their members returning to school, hold a car parade protest in front of the Pasco County School district office in Land O' Lakes, Florida, U.S. July 21, 2020.

An entrance to Public School 159 is seen locked in the Queens borough of New York City, New York, U.S., July 8, 2020.

A worker takes a break while cleaning up a basketball court at Glasgow Middle School, a Fairfax County Public School, on deadline day for families and teachers countywide to decide between teaching/learning from home or in the classroom due to the coronavirus disease (COVID-19), in Falls Church, Virginia, U.S., July 15, 2020.

A worker paints window frames during summer break renovations and installation of social distancing measures at St. Joseph's School, amid the outbreak of the coronavirus disease (COVID-19), in La Puente, near Los Angeles, California, U.S., July 14, 2020.

School Principal Luis Hayes looks at new sinks installed for students to wash their hands during summer break renovations and installation of social distancing measures at St. Joseph's School, amid the outbreak of the coronavirus disease (COVID-19), in La Puente, near Los Angeles, California, U.S., July 14, 2020.

School principal Frank Loya Jr. sets up social distancing dividers for students in a classroom at St. Benedict School, amid the outbreak of the coronavirus disease (COVID-19), in Montebello, near Los Angeles, California, U.S., July 14, 2020.

A woman walks her dog past a sign at Glasgow Middle School, a Fairfax County Public School, on deadline day for families and teachers countywide to decide between teaching/learning from home or in the classroom due to the coronavirus disease (COVID-19), in Falls Church, Virginia, U.S., July 15, 2020.

Image used for illustrator purpose A Fairfax County school bus sits in a depot, a day after it was announced the county would begin the school year all online, in Lorton, Virginia, U.S., July 22, 2020.

U.S. President Donald Trump stands next to a U.S. map of reported coronavirus cases as he speaks about the administration's plan for reopening schools during a coronavirus disease (COVID-19) news briefing at the White House in Washington, U.S., July 23, 2020. Image used for illustrative purpose

A Fairfax County school bus sits in a depot, a day after it was announced the county would begin the school year all online, in Lorton, Virginia, U.S., July 22, 2020.

Social distancing dividers for students are seen in a classroom at St. Benedict School, amid the outbreak of the coronavirus disease (COVID-19), in Montebello, near Los Angeles, California, U.S., July 14, 2020.

General view of Public School 111 in the Queens borough of New York City, New York, U.S., July 8, 2020.

A sign echoes staff sentiment at Belvedere Elementary School, a Fairfax County Public School, on deadline day for families and teachers countywide to decide between teaching/learning from home or in the classroom due to the coronavirus disease (COVID-19), in Falls Church, Virginia, U.S., July 15, 2020.