Biden drops out and endorses Harris: 5 things to look for this week

President Biden's announcement Sunday that he was dropping his bid for reelection and endorsing Vice President Kamala Harris to be the Democratic nominee answered the big question that had been swirling around his candidacy since his halting performance at last month's debate. But it triggered a slew of new ones.

Here are five questions that could be answered in the coming days.

When and where will Biden address the nation?

In a letter announcing his departure from the 2024 race, Biden said he would address the nation later this week about his decision. At the moment, it is unclear when or where that will be. Biden is currently at his home in Delaware recovering from COVID-19. He is still expected to host Israeli Prime Minister Benjamin Netanyahu at the White House sometime this week. Netanyahu is scheduled to address Congress on Wednesday.

When and where will Harris hold her first 2024 presidential rally?

In a statement Sunday, Harris said that she was "honored" by Biden's endorsement and vowed to "earn and win" the Democratic nomination. She had been scheduled to travel to Milwaukee for a campaign event on Tuesday. It is not clear whether Biden's announcement or expected address to the nation will change those plans.

Does Harris have any serious challengers?

After Biden's endorsement, numerous prominent Democrats — including some who were tabbed as possible candidates for the top of the ticket — quickly lined up behind Harris. Sen. Mark Kelly of Arizona and California Gov. Gavin Newsom endorsed her campaign. But CNN reported late Sunday that one former Democrat, independent Sen. Joe Manchin of West Virginia, is "considering" reregistering as a Democrat to challenge Harris for the nomination.

How will Republicans, including Trump, respond to her candidacy?

In a series of posts on Truth Social, former President Donald Trump did not directly reference Harris while responding to Biden's exit.

"He was annihilated in an Earth Shattering Debate, and now the Corrupt and Radical Democrats are throwing him overboard," Trump wrote. "He was not fit to serve from the very beginning, but the people around him lied to America about his Complete and Total Mental, Physical, and Cognitive Demise. Whoever the Left puts up now will just be more of the same. MAKE AMERICA GREAT AGAIN!"

Last week the Trump campaign sent a fundraising email that suggested Democrats would try to "steal the election" by swapping out Biden. After Biden's announcement on Sunday, Trump asked in a post on Truth Social if the Republican Party should "be reimbursed for fraud."

Will Trump agree to debate whoever becomes the Democratic nominee?

Trump and Biden were scheduled to have their second debate of the 2024 election on Sept. 10, hosted by ABC News. But the former president said in yet another Truth Social post on Sunday that it should be held on Fox News. "Now that Joe has, not surprisingly, has quit the race, I think the Debate, with whomever the Radical Left Democrats choose, should be held on FoxNews, rather than very biased ABC," Trump wrote.