In the hours since President Joe Biden endorsed Vice President Kamala Harris on Sunday afternoon, she has collected $49.6 million in grassroots donations, the campaign said.

-ABC News’ Rick Klein

More than 45,000 people gathered late Sunday on a Zoom call organized by Win With Black Women to support Vice President Kamala Harris' campaign.

The group said it raised over $1,500,000 in about 100 minutes.

The call was led by the group's founder, Jotaka Eaddy, and included lawyer Star Jones, Rep. Joyce Beatty and Shavon Arline-Bradley, the president and chief executive of National Council of Negro Women. Guests such as actor Jenifer Lewis and Alpha Kappa Alpha Sorority President Danette Anthony Reed chimed in with words of encouragement and wisdom.

Even after 1 a.m. on Monday, people continued trying to join the call, and donations kept pouring in. Zoom lifted the capacity limit to allow more people to join the call.

"Don't you ever lose faith in Black women," said Dr. Johnnetta B. Cole, a former president of Spelman College.

-ABC News' Katrina J. Davis

Vice President Kamala Harris on Sunday morning had multiple phone conversations with President Joe Biden before he announced that he would not be seeking reelection and would instead endorse her, according to a source familiar with her schedule.

Surrounded by family and staff at the vice president's residence, Harris spent more than 10 hours placing calls to over 100 party leaders, members of Congress, governors, labor leaders and leaders of advocacy and civil rights organizations. On each of those calls, Harris made clear that she was extremely grateful for the president's endorsement but plans to work hard to earn the Democratic nomination in her own right, the source said.

One of the calls was to her pastor, Amos Brown III, who, along with his wife, prayed over her, according to the source.

The vice president wore a hooded Howard University sweatshirt, workout sweats and sneakers throughout the day. Amid the many calls, she took time to arrange both lunch and dinner for the assembled aides. The menu was salad and sandwiches for lunch and pizza and salad for dinner. Harris' pizza came with anchovies, her go-to topping, the source said.

-ABC News’ Gabriella Abdul-Hakim, Fritz Farrow and Will McDuffie

The Democratic National Committee's next rules committee meeting will be at 2:00 - 5:00 p.m. ET on Wednesday, July 24, a source told ABC News. The meeting will be public and available on the DNC's YouTube page.

The co-chairs announced Sunday that following the President’s decision, it is now the committee's responsibility to implement a framework to select a new nominee, which will be open, transparent, fair and orderly.

The co-chairs announced that the process presented for consideration will be comprehensive and expeditious.

-ABC News' Gabriella Abdul-Hakim

Major Democratic donor, businessman and one-time presidential candidate Michael Bloomberg is urging the Democratic Party to take a step back and "take the pulse of voters" before determining "who is best positioned to win in November," saying "the decision is too important to rush."

"Democrats now have a chance for a fresh new start, and while some elected leaders and party officials make their endorsements, there are still four weeks before the party's more than 4,000 delegates convene in Chicago," Bloomberg posted Monday on X.

"That is more than enough time for the party to take the pulse of voters, especially in battleground states, to determine who is best positioned to win in November and lead the country over the next four years," Bloomberg continued. "We don’t need to get a resolution right away, but we do need to get it right. The decision is too important to rush, because the election is too important to lose."

Bloomberg also praised President Joe Biden for stepping down, calling it "an act of selflessness that only a great patriot would do."

-ABC News' Peter Charalambous and Soorin Kim