WASHINGTON (AP) - The latest from the Sunday night Democratic debate between former Vice President Joe Biden and Sen. Bernie Sanders (all times local):

9:05 p.m.

Another heated exchange in the first head-to-head debate between Joe Biden and Bernie Sanders is coming over the Vermont senator's assertion that Biden advocated for cuts in Social Security while serving as a U.S. senator.

Sanders repeatedly asked the former vice president during Sunday night's debate in Washington if he had pushed for cuts to the entitlement program on the floor of the U.S. Senate. Sanders also said Biden pushed for cuts needed in Medicare and veterans' programs.

When Biden several times said he had not done so, Sanders told viewers to "Go to the YouTube right now" to see what he characterized as video proving his case on Biden's comments.

Biden also responded by saying he has laid out a plan for adding to Social Security, as well as how he would pay for the changes -- a critique he has made repeatedly of Sanders' plans, particularly "Medicare for All."

8:45 p.m.

The top Democrats vying for their party's presidential nomination are using a question on the economic crisis prompted by the coronavirus outbreak to highlight the contrasts on how their campaigns would approach the issue.

Asked how he as president would alleviate the strains, Vermont Sen. Bernie Sanders said during Sunday night's debate in Washington that the crisis further shows the need for a holistic overhaul of the country's economic system.

Saying, "People are looking for results, not a revolution," former Vice President Joe Biden stressed he would focus on meeting "immediate needs" like helping Americans make sure not to miss mortgage payments.

Earlier Sunday, the Federal Reserve took massive emergency action to help the economy withstand the coronavirus by slashing its benchmark interest rate to near zero and saying it would buy $700 billion in Treasury and mortgage bonds.

8:30 p.m.

The first clash of the head-to-head debate between Joe Biden and Bernie Sanders is coming in the form of a dust-up over whether Sanders' signature health care plan is the best way to respond to the coronavirus.

After Sanders said the Trump administration's response to the outbreak laid bare the weaknesses of the nation's current health care system, Biden pointed out that Italy - where the virus has essentially quarantined the country, has a government-run health care system that hasn't alleviated the problem.

"With all due respect to 'Medicare for All,' you have a single-payer system in Italy," Biden said. "It doesn't work there."

Sanders responded by noting that experts say "one of the reasons that we are unprepared ... is that we don't have a system."

Sanders argues his single-payer health care system would provide free treatment for those diagnosed with COVID-19. Biden says he would authorize government funds to cover treatment.

8:20 p.m.

Bernie Sanders says President Donald Trump needs to stop "blabbering" with inaccurate information about the novel coronavirus.

Sanders and Joe Biden are addressing how they'd respond to the new virus during the first questions in Sunday's Democratic presidential debate. It's the first debate between just the two Democratic presidential contenders and the first since the U.S. dramatically increased its response to the virus.

Sanders says if he were president he would make sure no one has to pay for coronavirus testing or treatment. Biden later said he also believes no one should have to pay.

Biden says every state needs to have at least 10 drive-thru testing locations and that the Defense Department and the Federal Emergency Management Agency need to be making plans to set up additional hospital beds.

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8 p.m.

Former Vice President Joe Biden and Vermont Sen. Bernie Sanders have taken the stage for the first one-on-one debate of the Democratic primary.

The leading Democratic candidates are facing off Sunday night in Washington in the 11th debate of the primary season. The event was moved from Arizona, which votes Tuesday, because of concerns over the growing coronavirus pandemic, and is being held without an audience.

Biden also steps on the stage as the front-runner in a race dramatically different from the party's last debate less than three weeks ago, following cascading wins that started with his resounding victory in the South Carolina primary. Other moderates departed the race, with several consolidating around Biden and united by a desire to block Sanders.

The fast-moving coronavirus has largely grounded the candidates, leading them to cancel rallies even as several big states prepare to vote on Tuesday. They greeted each other with an elbow bump.

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