President Joe Biden said Wednesday that the Centers for Disease Control and Prevention will "probably" advise children under age 12 who are not yet eligible to be vaccinated against Covid-19 to wear masks in school this fall.

Biden said at a CNN town hall in Cincinnati that kids older than 12 who are fully vaccinated should not wear masks, but he acknowledged that it could be difficult for some school districts to determine who is and is not vaccinated.

"It's going to get a little big tight in terms of, well, are Mom or Dad being honest that Johnny did or did not get vaccinated? That's going to raise questions," Biden said. "It's a matter of community responsibility."