AP: Joe Biden formally clinches Democratic nomination, setting up challenge to President Trump amid pandemic, economic collapse and unrest

Since clinching the nomination, however, Biden has worked to build his appeal among progressives, forming joint task forces with Sanders' campaign to find common ground on key issues like health care, the economy and the environment. Biden has also embraced a plan to forgive millions of Americans' student debt, meaning that he clinches the nomination as easily the most liberal standard bearer the Democratic Party has ever had.