According to an official, Biden plans to campaign with Harris in the battleground states as soon as his doctor clears him.
REHOBOTH BEACH, Delaware (WPVI) -- As news broke on Sunday that President Joe Biden would be dropping out of the 2024 presidential race, he was recovering at his Delaware beach home from COVID-19.
On Monday, the president continued to isolate in Rehoboth Beach as he supports his vice president as the next potential Democratic nominee.
In her first appearance since the endorsement, Kamala Harris praised the president during her trip to The First State.
"I am firsthand witness that every day, our president Joe Biden fights for the American people," Harris stated.
Biden made an appearance as well, calling into Harris' campaign headquarters in Wilmington.
"I want you to know, I won't be on the ticket, but I'm still going to be fully, fully engaged," the president noted. He also thanked his staffers and voiced his continued support for Harris.
"Joe is not done, far from it," Harris said as she formally accepted the nomination from Biden. "He knows there is still more work to do, and our nation will continue to praise his bold and visionary leadership as president. Thank you, Joe."
Biden's decision to bow out followed escalating pressure from his Democratic allies to step aside after he debated with Donald Trump.
Some Republicans are even questioning whether Biden can stay in office until the end of his term.
"If he's not suited to run for office, I'm not sure he's suited to serve the country," said Republican House Speaker Mike Johnson.
Despite this, the focus of many has shifted to Harris.
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"She's the future. Donald Trump is yesterday's chaos, and why would we go back to it?" questioned Democratic Senator Tim Kaine.
Trump has since taken to TruthSocial, posting his opinions on the drastic change in the upcoming election.
"The Democrats pick a candidate, Crooked Joe Biden, he loses the Debate badly, then panics, and makes mistake after mistake, is told he can't win, and decide they will pick another candidate, probably Harris," he wrote.
Trump also posted polls showing his lead over Harris, writing, "Joe Biden will go down as the Worst President in the history of the United States. KAMALA, OUR HORRIBLE & INCOMPETENT BORDER CZAR, WILL BE WORSE!"
Back in Delaware, Harris went after Trump, saying she would proudly put her record against his.
"We are going to take our case to the American people, and we are going to win," she said.
As Biden remains in Rehoboth Beach, the Secret Service and Delaware State Police are stationed outside his neighborhood.
Even with the added security, some supporters stopped by, hoping to express their gratitude.
"This morning I woke up and I was like, 'You know what? See if you can go down there and wave goodbye and say thank you.' Because you don't know when you're going to have another chance," noted Jake Carpenter from Lincoln, Delaware.
Biden is expected to return to the White House on Tuesday.
According to a senior administration official, Biden plans to campaign with Harris in the battleground states as soon as his doctor clears him.
He is also set to address the nation later this week and elaborate on his decision to bow out of the race.