WASHINGTON (AP) – President Joe Biden has opened his first formal news conference with a nod toward the improving picture on battling the coronavirus, but he was immediately pressed on thorny issues, like immigration and voting rights, now testing his administration. Biden doubled his original goal on COVID-19 vaccines by pledging that the nation will administer 200 million doses by the end of his first 100 days in office. The administration had met Biden’s initial goal of 100 million doses earlier this month – before even his 60th day in office – as the president pushes to defeat a pandemic that has killed more than 545,000 Americans and devastated the nation’s economy.