The press has questions for Vice President Kamala Harris. She isn’t giving a whole lot of answers.

In the nearly three weeks since President Biden withdrew his candidacy, catapulting Ms. Harris to the top of the Democratic ticket, the vice president has shown little eagerness to meet journalists in unscripted settings. She has not granted an interview or held a news conference. On Thursday, after a rally in Michigan, she held her first “gaggle” — an impromptu Q.-and-A. session — with reporters covering her campaign.

It lasted 70 seconds.

Ms. Harris replaced a Democratic nominee who has hosted fewer White House news conferences than any president since Ronald Reagan. Now she is taking a similarly cautious approach, relying on televised rallies and prepared statements amid a tightly controlled rollout of her candidacy.

Asked on Thursday if she might sit for an interview anytime soon, Ms. Harris suggested that she would get through the convention first. “I want us to get an interview scheduled before the end of the month,” she said, as aides signaled to the scrum of journalists that question time was over.

Ms. Harris’s lack of engagement with the media has become a constant rallying cry on the political right, with Republican critics and Fox News stars accusing the vice president of ducking scrutiny. The Harris campaign says it is being thoughtful about how best to deploy its message, and to introduce a new candidate to crucial voters in battleground states.

David Axelrod, the architect of former President Barack Obama’s winning campaigns, believes that Ms. Harris — who on Thursday said she had agreed to a prime-time debate on Sept. 10 with her opponent, former President Donald J. Trump — was trying to strike a balance.

“This has been a whirlwind few weeks, and right now, buoyant rally speeches are working really well, so she’s riding the wave,” Mr. Axelrod wrote in an email. “But I’m sure they know that, in addition, presidential races impose a series of tests, including debates and unscripted interactions with voters and media, by which people come to know you. There is time, and I’m sure she’ll get there.”