Joe Biden has no foreseeable plans to resume in-person campaigning amid a pandemic that is testing whether a national presidential election can be won by a candidate communicating almost entirely from home.

The virtual campaign Biden is waging from Wilmington, Delaware, is a stark contrast with President Donald Trump , who is planning travel despite warnings from public health experts about the coronaviruss spread. It also intensifies the spotlight on how Biden, the presumptive Democratic nominee, will manage his campaign, with some in his party fretting that his still-developing approach isnt reaching enough voters.

For now, Biden and his aides are brushing back hand-wringing from Democrats and mockery from Republicans who argue that the 77-year-old is hiding in his basement.

Voters dont give a s- about where hes filming from, campaign manager Jen OMalley Dillon told The Associated Press. What they care about is what hes saying and how we connect with them.

Biden was more diplomatic in assessing the situation on Tuesday.

The idea that somehow we are being hurt by my keeping to the rules and following the instructions that (have) been put forward by doctors is absolutely bizarre, he told ABCs Good Morning America.

OMalley Dillon took the helm of Bidens campaign in mid-March, just as coronavirus shutdowns commenced. She recently beefed up the campaigns digital and finance teams and said shell unveil battleground state leadership in coming weeks. She also pointed to budding partnerships that include the national partys battleground state program.

But those moves havent prevented critiques from prominent Democrats, including the architects of President Barack Obama s 2008 campaign, who question Bidens digital savvy and capacity to build the national vote-by-mail effort that might be necessary to win during a pandemic.

Obama allies David Plouffe and David Axelrod wrote in a recent New York Times op-ed that Bidens home studios resemble an astronaut beaming back to earth from the International Space Station. They encouraged Biden to make wider use of platforms from Facebook and Twitter to Snapchat, Instagram and TikTok.

In a similar piece, Lis Smith, media strategist behind Pete Buttigiegs 2020 campaign, touted the virtues of local-market media and using celebrities more on other platforms.

Yvette Simpson, who leads the progressive group Democracy for America, said shes very concerned she cannot see how were going to engage people. She said the campaign has squandered time since Biden took command of the primary in early March.

House Majority Whip Jim Clyburn of South Carolina, a close Biden friend whose endorsement helped spur his run of primary victories, said hes very worried about Democrats building a voter turnout operation that balances in-person voting with absentee balloting.

Clyburn, however, emphasized that its not Bidens place to worry over the details.

His job is to be the candidate, Clyburn said.

To some degree, the naysaying reflects Democrats desperation to beat Trump who holds a clear early lead in fundraising and organizing and the reality that Biden emerged from a haphazard primary campaign and must now play catch-up.

Tara McGowan, founder and CEO of the Democrat-aligned digital firm ACRONYM, credited the campaign with making progress. You cant just snap your fingers and create an entirely different culture in their campaign, she said.

Clyburn argued theres been a turnaround, especially in fundraising. Winning is a great tonic, he said.

Biden raised $46.7 million in March, and in April he combined with the Democratic National Committee to raise $60.5 million. Trump and the Republican National Committee have far outraised Democrats this cycle, and they have more than $250 million cash on hand, but Bidens April total nearly pulled even with Trumps monthly total of $61.7 million.

Erskine Bowles, one of Bidens fundraisers and a former chief of staff to President Bill Clinton, said the question isnt whether Biden will catch Trump in total fundraising he wont but whether he will have the resources to build a winning campaign.

People are giving to make sure he does, Bowles said.

From inside the campaign, the outside worries seem as much about timing and perception as about reality: The April and May fundraising windfall is just now being put into hiring. Biden has ramped up his social media presence, including a recent Instagram appearance with soccer star Megan Rapinoe and an economic speech on NowThis, a digital news medium targeting younger voters.

OMalley Dillon said she has zero concern that were not at pace.

Critics, Biden allies say, also gloss over how Bidens core pitch touting his experience and empathy, making a moral and competence case against Trump, and promising to rebuild the middle class won over Democratic primary voters even before the coronavirus upended daily life. Now, Bidens argument against Trump is sharpened but stems from the same roots, with recent polling suggesting its reaching voters.

Joes got the right message, Clyburn said.

Indeed, days before his co-signed critique was published, Plouffe appeared at a Biden fundraiser that pulled in more than $1 million. On that call, Plouffe agreed with OMalley Dillon that Trumps turbulent presidency alongside Bidens candidacy means an expanded map of battleground states.

Trump is answering with a daunting reelection behemoth.

On a call with reporters Tuesday, the presidents daughter-in-law, Lara Trump, called it the largest field and data program in GOP campaign history. And while OMalley Dillon has spent two months building a general election campaign in a new digital environment, Brad Parscale has long been established in his role as Trumps campaign manager.

The Trump campaign hasnt had to worry about money, with the president pulling in more than $700 million so far this cycle.

The Trump campaign never skipped a beat when the emphasis shifted to digital, Lara Trump said.

And now the president wants to return to a conventional travel schedule. He travels next on Thursday to Pennsylvania, and aides say he wants to travel at least once a week.

Biden, meanwhile, is anxious to go out and campaign but is staying home to set an example with this health and economic crisis.

This is not politics, Biden said. This is life.

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Associated Press writers Zeke Miller, Julie Pace and Will Weissert contributed from Washington.

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This story has been corrected to show that Clyburn is the House majority whip, not the minority whip.