President Joe Biden predicted that most elementary schools will be open five days a week by the end of his first 100 days in office, but said it will be tougher for high schools to reopen at the same rate because of the risk of infection.

If all schools adhered to the CDC guidelines, many that are fully now open would close for in-person learning or need to return to a hybrid system.

As the White House struggles to flesh out President Biden’s promise to reopen schools within 100 days, aides have found themselves steadily lowering expectations.

After seeing two academic years thrown off course by the pandemic, school leaders around the country are planning for the possibility of more distance learning next fall at the start of yet another school year.