Klain, 59, served as Biden's chief of staff when he was vice president under President Barack Obama and had been widely expected to be named to the post.
He also has experience battling a public health crisis, as he worked as Obama's "Ebola Czar" in 2014 during an outbreak of that virus in Africa. A fierce critic of Trump's handling of the
coronavirus pandemic, Klain is expected to be a key figure in Biden's response to the health crisis.
As Biden moved toward assuming office, Trump's campaign filed a federal lawsuit in Michigan as it continued its long-shot legal strategy of trying to overturn the election results in key states.
All week, Biden has paid little public attention to Trump's unsubstantiated claims of voter fraud, instead focusing on transition issues as he prepares to be sworn in on Jan. 20.
Biden clinched victory last Saturday as he won a series of battleground states to exceed the 270 electoral votes needed in the state-by-state Electoral College that determines who wins the presidency. Biden also was winning the national popular vote by more than 5 ...