Former Vice President Joe Biden and Sen. Bernie Sanders sought in the Democratic debate to cast themselves as best-positioned to lead the nation through a global pandemic, uniting in their criticism of President Donald Trump’s response to the fast-moving coronavirus but diverging in how they would confront the spiraling public health and economic crisis.

Biden pledged Sunday to deploy the United States military to help with recovery efforts and warned that a federal financial bailout may be necessary to stabilize the economy. Sanders leaned into the same domestic policy proposals that have dominated his campaign, arguing that the government-run health insurance system he has long championed would allow the U.S. to respond faster to a health crisis.

The coronavirus outbreak has rapidly reshaped nearly all aspects of American life, shuttering schools across the country and significantly curtailing travel. Virus fears have also halted campaign rallies and prompted some states to delay upcoming primaries because of warnings from public health officials against large gatherings.

“This is bigger than any one of us — this calls for a national rallying for one another,” Biden said.

Indeed, the stakes in the race for the Democratic presidential nomination have shifted dramatically since Biden and Sanders last debated less than three weeks ago — as have the contours of the contest. After a sluggish start to the primary season, Biden has surged to the front of the field, drawing overwhelming support from black voters and consolidating the backing of several more moderate rivals who have dropped out of the race. He’s also actively courting the endorsement of Sen. Elizabeth Warren, a liberal ally of Sanders who dropped out without throwing her support behind him.

The former vice president appeared determined throughout Sunday’s contest to keep his focus on the general election, making direct overtures to Sanders’ loyal supporters and committing for the first time to select a woman as his running mate if he becomes the Democratic nominee. After Biden’s announcement, Sanders said he would “in all likelihood” do the same.

For Sanders, the reality is that his path to the nomination is rapidly shrinking, and he faces the prospect of more stinging defeats in the four states that vote on Tuesday. Still, he appeared determined to draw sharp contrasts with Biden throughout the debate, challenging him aggressively on the Iraq War and free trade deals. He argued that “I have taken on every special interest that’s out there,” adding, “That’s a very different record than Joe’s.”