Election 2024: Donald Trump selects his campaign manager as incoming White House chief of staff

As Democrats pick up the pieces following President-elect Donald Trump's decisive victory, some of the vice president's backers are expressing frustration that Biden's decision to seek reelection until this summer - despite longstanding voter concerns about his age and unease about post-pandemic inflation as well as the U.S.-Mexico border - all but sealed his party's loss of the White House.

"The biggest onus of this loss is on President Biden," said Andrew Yang, who ran against Biden in 2020 for the Democratic nomination and endorsed Harris' unsuccessful run. "If he had stepped down in January instead of July, we may be in a very different place."

Biden is set to deliver a Rose Garden address Thursday about the election. He issued a statement shortly after Harris delivered her concession speech on Wednesday, praising Harris for running an "historic campaign" under "extraordinary circumstances."

The NAACP organization will seek common ground to work with President-elect Donald Trump's administration, President Derrick Johnson said in a statement.

In the 2024 election cycle, the NAACP spent $20 million to get out the vote and mobilize 14.5 million Black voters.

While the organization did not and does not endorse candidates, the group has agreed to work to advance policies that they believe support the advancement of Black and Brown Americans.

"Our resolve remains stronger than ever as we advocate for policies that dismantle systemic injustices and support the American dream. This new chapter presents an opportunity to chart a course that unites Americans through integrity, understanding, and inclusion," Johnson said on Wednesday.

"Where there is common ground, we will strive to collaborate with the President-elect and his administration. The NAACP is loyal not to politicians, but to policies that allow us to keep advancing, no matter what," Johnson added.

Elon Musk and Robert Kennedy, Jr. spent much of the day at Mar-a-Lago where President-elect Donald Trump was hunkered down and making calls to lawmakers and allies following his election victory.

Both Musk and Kennedy were involved in meetings with top transition officials at Mar-a-Lago as Trump prepares to build out his Cabinet and top administration posts, sources told ABC News.

Musk left West Palm Beach Wednesday.

The visit comes after Musk poured millions into his America PAC, helping to boost Trump to victory -- and as he's promised to help make significant cuts to the federal budget as part of a role tasked with government efficiency.

Meanwhile Kennedy, who Trump has repeatedly vowed to put in a prominent role in his administration, said in an interview earlier Wednesday he would consider gutting the Food and Drug Administration's nutrition department.

Former Speaker Nancy Pelosi, D-CA, thanked Vice President Kamala Harris and Gov. Tim Walz for their campaign in a statement Wednesday evening, saying they "will continue to be magnificent forces for the good in our country."

"We all pray for America's success under the next Administration. The peaceful transfer of power is the cornerstone of our democracy. After every election, we all have a responsibility to come together and find common ground," Pelosi said.

Pelosi did not mention Donald Trump by name or recognize his victory in the statement.

"House Democrats are united behind Hakeem Jeffries as we vow to continue putting people over politics and fighting for America's working families with liberty and justice for all," she said.

Pelosi attended Howard University earlier in the day to hear Harris deliver her concession speech.