 From NPR and WBUR, I'm Deepa Fernandes in Alameda, California. And I'm Celeste Headley in Washington, D.C. It's Here and Now. The Biden campaign says it is not working through any scenarios where someone other than the president is at the top of the ticket. But the first Senate Democrat to call for Biden to bow out of the race says the pressure for Biden to leave is intensifying. We'll hear from him in a minute.