But teachers' unions across the United States are refusing to resume in-person learning, claiming teachers would be in danger.
Biden campaigned on dealing with the CCP virus pandemic. He vowed to spearhead the reopening of schools.
Asked why so many public schools remain closed, his chief of staff Ron Klain said it was a funding issue.
"That's why the president of the United States sent a plan to Congress even before he took office to make the investments you need to make the schools safe," Klain said during an appearance on CNN's "Erin Burnett OutFront," referring to Biden's $1.9 trillion proposal that includes a number of measures such as a minimum wage hike.
Biden, in remarks at the White House on Tuesday, called for Congress to pass the proposal "to help schools and businesses reopen."
"In other states, we haven't seen those kinds of investments. President Biden has sent a plan to Congress that will make sure that the majority of our schools can be reopened in 100 days. We need Congress to pass that plan so that we can do the kind of things you need to do so that the schools can be safe, so the students can be safe, so the teachers can be safe. Sadly, it costs money," Klain said.
When the host pushed back and pointed to Chicago, asking why the union seemed to be going against what studies show, he added: "I don't think that teachers' unions are overruling studies. I think that what you're seeing [is] that schools haven't made the investments to keep the students safe. I mean, again, the Wisconsin study were classrooms of 12 on average. So that requires a lot more classrooms, a lot more teachers, or, you know, other kinds of arrangements to get them small, podding students very carefully."
"So we need to do the things to open safely. Most of the teachers I talk to, they want to be back in the classroom. They just want to know that it's safe and we as a country should make the investments to make it safe," Klain added.