Vice President Kamala Harris, now the likely Democratic nominee, has the chance to encourage and embrace the kind of close examination that the public so far has had little opportunity to witness during the 2024 race.

Americans deserve a campaign that tests the strengths and weaknesses of the candidates; that highlights their differences and allows scrutiny of their plans; that motivates people to vote by giving them a clear account of how their choice in this election will affect their lives.

Americans deserve the opportunity to ask questions of those who are seeking to lead their government.

There are promising signs in the early days of Ms. Harris’s candidacy. She has bounced onto the campaign trail with a sense of joyful purpose, seizing the opening to reintroduce herself. She has begun to detail the dangers of a second Trump presidency and to delineate her differences with Donald Trump, while describing her vision for a country where people have the support they need to prosper.

But she needs to do more, and she needs to do it quickly. Ms. Harris ought to challenge Mr. Trump to a series of debates or town halls on subjects of national importance, such as the economy, foreign policy, health care and immigration. Mr. Trump claims that he is ready and willing to participate in debates once Democrats have officially selected a nominee. Americans would benefit from comparing the two candidates directly.

Both candidates need to start taking questions from reporters, too. Candidates have abundant opportunities to speak directly to voters, through social media and tightly controlled public appearances, without the mediation of journalists. Most voters, however, will never be able to speak directly with candidates. President Biden has rarely granted the news media permission to ask questions on behalf of the American people, and on the rare occasions he did, his team sometimes sent scripted questions. It left him poorly prepared for the campaign trail and for confronting his opponent. Mr. Trump, too, rarely takes questions. Ms. Harris has the chance to do better.