When he formally announced his entry into the 2020 presidential race, Joe Biden declared that he stood for two things - workers who "built this country", and values that can bridge its divisions. As the US faces challenges from coronavirus to racial inequity, his pitch in essence is to create new economic opportunities for workers, restore environmental protections and healthcare rights, and international alliances. He will officially become the Democratic presidential nominee on Thursday when he will deliver this message to a national audience. Here in detail is where the candidate stands on eight key issues. A national test and trace programme Mr Biden's approach to tackling coronavirus, the most immediate and obvious challenge facing the country, is to provide free testing for all and hire 100,000 people to set up a national contact-tracing programme. He says he wants to establish at least 10 testing centres in every state, call upon federal agencies to deploy resources and give firmer national guidance through federal experts. He says all governors should mandate wearing masks. Voters suspicious of federal authority will see this as overreach, but it lies very much in line with Mr Biden's and Democrats' general view on the role government should play. Raise minimum wage and invest in green energy To address the immediate impact of the coronavirus crisis, Mr Biden has vowed to spend "whatever it takes" to extend loans to small businesses and increase direct money payments to families. Among the proposals are an additional $200 in Social Security payments per month, rescinding Trump-era tax cuts and $10,000 of student loan forgiveness for federal loans. Mr Biden's broader economic policies, dubbed his "Build Back Better" plan, tries to please two constituencies that traditionally support Democrats - young people and blue collar workers. He supports raising the federal minimum wage to $15 (£11.50) an hour - a measure that is popular among young people and that has become something of a totem figure for the party in 2020, and a sign of its move to the left. He also wants a $2tn investment in green energy, arguing that boosting green manufacturing helps working class union workers, who perform most of those jobs. There is also a $400bn pledge to use federal dollars to buy American goods, alongside a wider commitment to enforce "Buy American" laws for new transport projects. Mr Biden was previously criticised for backing the North American Free Trade Agreement (Nafta), which critics say shipped jobs overseas. His 2020 plan calls for the federal government to invest $300bn in US-made materials, services, research and technology.