Vice President Kamala Harris on Wednesday accepted a third date option proposed by CBS News for a vice-presidential debate, a Biden campaign official said.

The new proposed date is for Monday, Aug. 12, according to the Biden campaign.

"Now that the Trump campaign has selected a running mate, we encourage them to agree to a debate between Vice President Harris and Senator Vance," the campaign official said.

On May 16, CBS News offered two debate date options on either July 23 (the week after the RNC) or Aug. 13 (the week before the DNC), which Harris accepted at the time.

The next day Trump accepted a Fox News proposal for his eventual running mate -- who we now know is Vance.

"On behalf of the future Vice President of the United States, who I have not yet chosen, we hereby accept the Fox Vice Presidential Debate, hopefully at Virginia State University, the first Historically Black College or University to host a Debate - Date to be determined," Trump posted on Truth Social at the time. "I urge Vice President Kamala Harris to agree to this. MAKE AMERICA GREAT AGAIN!"

Fox News’ VP debate offer was for the same dates CBS News originally offered.

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

Rep. Adam Schiff is calling on President Joe Biden to drop out of the race and "pass the torch."

"While the choice to withdraw from the campaign is President Biden's alone, I believe it is time for him to pass the torch. And in doing so, secure his legacy of leadership by allowing us to defeat Donald Trump in the upcoming election," Schiff said Wednesday in a statement released by his office.

Schiff is running for California Senate, and he led the first impeachment inquiry into President Donald Trump.

"Joe Biden has been one of the most consequential presidents in our nation's history, and his lifetime of service as a Senator, a Vice President, and now as President has made our country better," his statement read.

"But our nation is at a crossroads. A second Trump presidency will undermine the very foundation of our democracy, and I have serious concerns about whether the President can defeat Donald Trump in November," he continued, then calling on the president to "pass the torch."

"But make no mistake, whoever our party ends up nominating, or if the nomination remains with the president, I will do everything I can to help them succeed. There is only one singular goal: defeating Donald Trump. The stakes are just too high," he added.

The Los Angeles Times first reported the news.

-ABC News' Lauren Peller

A call between Biden and the New Democrat Coalition, a group of center-left congressional Democrats, got heated, a source with knowledge of the conversation told ABC News.

Biden got angry with the group, yelled at one, Rep. Jason Crow of Colorado, and then got off the call before other members could confront him about stepping aside, according to the source.

"It was bad," one member on the call said, according to the source. "No plan."

When members pressed him on how he would turn the campaign around, Biden just listed policy achievements and insisted his polls look better, the source said.

Biden got off the call before Rep. Mike Quigley, who has called on him to step aside from his campaign, could ask a question, according to the source.

-ABC News' Rachel Bade

Biden spoke with the Congressional Progressive Caucus members Saturday to discuss his plan moving forward with his campaign.

Washington Rep. Pramila Jayapal, the caucus' chair, said in a statement that the conversation was "productive and engaging."

"We spoke frankly to the President about our concerns and asked tough questions about the path forward. We appreciate his willingness to thoughtfully answer and address our Members," she said in her statement.

Saturday's meeting came a day after the president met with the Congressional Asian Pacific American Caucus and the Congressional Hispanic Caucus's political arm, BOLD PAC, Friday.

-ABC News' Fritz Farrow and Lauren Peller