Leaders of the Democratic Party of the United States have called on President Biden and his campaign to provide convincing evidence that he has a viable path to victory in the general election. It is reported that the current Democratic poll results in key states are still following the trend, and Democrats are increasingly worried that Biden will not be able to defeat Trump in November. According to reports, senior union leaders in the United States have also expressed serious concerns about Biden's candidacy. At a closed-door meeting held on the 10th, some union leaders said that doubts about Biden's presidential competence are undermining his candidacy, and repeatedly asked Biden's campaign team about its plan to defeat Trump. (CCTV News)