One of the hardest decisions for any candidate is whether to drop out of a race. It's even harder for the Vermont senator, who, at 78, likely wouldn't run for president again.
Pressure is increasing to make mail voting more available nationwide in response to the coronavirus pandemic, but President Trump on Tuesday called it "very dangerous."
Wisconsin is holding a statewide election under challenging circumstances amid the pandemic. Despite efforts to delay voting and move to mail-in ballots, long lines were reported around the state.
NPR science and politics reporters and a Wisconsin Public Radio correspondent relay the latest updates in the United States response to the coronavirus epidemic.
Gov. Tony Evers tried to postpone voting and extend the absentee deadline, but he was blocked by courts. Results for Tuesday's contests are not expected for days.
A White House adviser suggested Joe Biden call the president instead of criticizing him in public, and both sides characterized Monday's call positively.