Seven Democratic candidates for president took the stage in Charleston, South Carolina, in a debate hosted by CBS News. Watch the debate in its entirety here.
Bernie Sanders was also pressed about his comments on "60 Minutes" about Fidel Castro, saying "Cuba is a dictatorship. I've said that 8 million times."
But many say this 10th debate made them nervous about the Democratic field.
But almost no candidate was unscathed in the debate, which took place just four days before the pivotal South Carolina primary and one week ahead of Super Tuesday.
Biden said winning South Carolina by even one percentage point would be "enough" for him to stay in the race.
Six Democratic candidates for president join CBS News in the spin room to review their debate performance in Charleston, South Carolina.
Italy reported a 45% single-day increase in infections and stock prices dropped on U.S. markets again.
Tonight's debate is the final one before the South Carolina primary on Saturday — and before voters in 16 states and territories go to the polls on Super Tuesday, March 3.
Democrats vying for the presidential nomination said they would boost federal funding for the Centers for Disease Control and the National Institutes of Health and improve relations with U.S. allies.
Joe Biden enters South Carolina debate with a slim lead over frontrunner Bernie Sanders; Charleston coffee shop empowers special needs people with jobs