Former President Barack Obama has also endorsed Vice President Harris.
Vice President Kamala Harris wrapped up what has been a whirlwind week in the presidential race with her campaign saying Sunday it has raised more than $200 million in less than a week.
On Thursday night, Harris met with Israeli Prime Minister Benjamin Netanyahu and took the lead in addressing the public about their discussions.
Harris has secured commitments from enough delegates to become the presumptive nominee if they all honor their commitment when voting, according to ABC News reporting.
Harris on Sunday spoke with Pennsylvania Gov. Josh Shapiro, whose name has come up as a possible vice-presidential pick, a person familiar with the conversation confirmed to ABC News.
The source noted that Harris also spoke with House Minority Leader Hakeem Jeffries on Sunday.
-ABC News' Fritz Farrow
Independent Sen. Joe Manchin of West Virginia is considering reregistering as a Democrat to run against Vice President Kamala Harris for the presidential nomination, two sources with knowledge of his decision told ABC News.
The development comes hours after Manchin said he would not run if Biden dropped out of the race.
"No, I want to support a new generation," Manchin told CNN's Jake Tapper on "State of the Union" Sunday.
-ABC News' Rachel Scott
Attorney General Merrick Garland and Secretary of State Antony Blinken addressed President Joe Biden's decision not seek reelection, with both men sharing their respect for their commander in chief.
"From the beginning of his tenure, President Biden has made clear in both word and deed that he stands for the rule of law and for the Justice Department's critical mission to protect the safety and the civil rights of everyone in our country," Garland said in his statement. "I am grateful for his leadership and for the enormous respect he has shown for the 115,000 public servants of the Justice Department over the past three and a half years. As President Biden has noted, there is critical governing work to be done in the months ahead, and the Justice Department will continue to work tirelessly to uphold the rule of law, keep our country safe, and protect civil rights on behalf of the American people."
Blinken called his time with Biden "the honor" of his life.
"It has been — and remains —the honor of my life to work for @POTUS for the past twenty-two years. He has restored U.S. leadership around the world and delivered historic accomplishments as President. I look forward to building on that record with him over the next six months," Blinken said in a post on X.
In a message sent after President Joe Biden announced he would leave the presidential race and endorse Vice President Kamala Harris, the DNC asked supporters for small-dollar donations.
"In the coming days, the Party will undertake a transparent and orderly process to move forward as a united Democratic Party to defeat Donald Trump in November," they wrote.
