2024 election updates: Manchin the latest to call on Biden to end reelection bid

The White House announced Thursday morning that the much-anticipated Biden's press conference will now start at 6:30 p.m. local time in Washington, instead of the previous 5:30 p.m. start time.

Biden has a busy day of meetings tied to the NATO summit ahead of the press conference, including a meeting with Ukrainian President Volodymyr Zelenskyy.

The presser will be held at the Walter E. Washington Convention Center, and is his first solo press conference in eight months.

President Joe Biden will take questions from the media on Thursday at 5:30 p.m. ET, his first press conference since the controversy over his candidacy erupted following his debate performance.

Biden has had fewer pressers with the media than his predecessors and the last time he took questions solo was back in November 2023.

The upcoming press briefing is being held at the Washington Convention Center, where Biden will spend a third day at the 2024 NATO Summit.

Arizona Gov. Katie Hobbs, a Democrat who participated virtually in the recent meeting between President Joe Biden and governors, has joined the chorus of governors expressing concerns about Biden, telling reporters on Wednesday that Biden "has a lot to do" to assure voters about his capabilities.

"I know that Arizonans have been concerned about the president’s age, and since the debate, I think those concerns are even more top of mind, and I think the president has a lot to do to assure Arizonans and Americans. And I know that he knows that that is his job over the coming weeks," Hobbs said, according to public radio station KJZZ.

Asked if she has concerns about Biden being able to do the job of president for four more years, she said, "Joe Biden can do the job, and that’s all I’m gonna to say about the situation."

"I have one vote in this election, just like everyone else. And to me, the choice is abundantly clear. The guy who’s gonna uphold democracy and the guy who’s trying to tear it down," she added later.

Sen. Peter Welch of Vermont called for Biden to withdraw from the 2024 race in a Washington Post op-ed published Wednesday evening.

Welch is the first Senate Democrat to officially call for Biden to step aside.

"I understand why President Biden wants to run. He saved us from Donald Trump once and wants to do it again. But he needs to reassess whether he is the best candidate to do so. In my view, he is not," Welch wrote.

"I deliver this assessment with sadness. Vermont loves Joe Biden. President Biden and Vice President Harris received a larger vote percentage here than in any other state. But regular Vermonters are worried that he can’t win this time, and they’re terrified of another Trump presidency," he said.

-ABC News' Allison Pecorin