It quoted the person as saying it would not be a surprise if Biden soon endorsed Vice President Kamala Harris to replace him as the Democratic candidate. Former president Obama meanwhile had reportedly told allies that Biden should "seriously consider the viability of his candidacy," the Washington Post reported. The Axios news outlet separately quoted party figures as saying that Biden could drop out as soon as this weekend, while broadcaster NBC quoted a person close to Biden as saying: "We're close to the end." However the split-screen with Donald Trump could not be more stark, with Trump set to formally accept the Republican nomination in Milwaukee as Biden hunkers down. Republicans find themselves newly unified after former president Trump, who at 78 is just three years younger than Biden, survived an assassination attempt on Saturday that left him with a bandaged ear.