The president, delivering remarks at a construction site outside Chicago, said that encouraging Americans to get vaccinated had helped, but it had not gone far enough to address the pandemic.
“Even after all of these efforts, we still have more than a quarter of the people in the United States who are eligible for vaccinations but didn’t get the shot,” Mr. Biden said. “That’s why I’ve had to move toward requirements.”
He said mandates had not been his first instinct, but the requirements were “already proving that they work.”
The president said on Thursday that the rule would be put in place quickly, but officials familiar with the process said it was likely to take several more weeks.
In the meantime, Mr. Biden sought to shift responsibility toward companies, which he said would help lead the United States out of the pandemic: “Businesses have more power than ever before to change the arc of this pandemic and save lives.”