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WASHINGTON – Democrat Joe Biden is hedging on whether he would mandate that all Americans be vaccinated against COVID-19.

Biden said Thursday during a town-hall-style event in Philadelphia that it would depend on the reliability of the vaccine.

He says that it would “have to have a very positive impact and how you can affect positively 85% of the American public,” and that he would likely receive the vaccine if it met that criteria.

Biden says we “should be talking about” mandating the vaccine, knowing that it’s difficult to enforce. But likewise, he says, it’s difficult to enforce a mask mandate, though scientists suggest they slow the spread.

“You can go to every governor and get them in a room,” he says. “The words of a president matter, no matter whether they’re good, bad or indifferent, they matter.”