PHILADELPHIA (AP) - Two days from the inauguration, President-elect Joe Biden and Vice President-elect Kamala Harris pitched in on Martin Luther King Jr. Day service projects as a militarized and jittery Washington prepared for a swearing-in that will play out under extraordinary security.
Biden and his wife, Jill, joined an assembly line in the parking lot of Philabundance, an organization that distributes food to people in need, and helped fill about 150 boxes with fresh fruit and nonperishables.
As Biden and Harris took breaks from their inaugural preparations to honor the civil rights hero Monday, outgoing President Donald Trump remained out of public view at the White House for the sixth straight day. In past years, Trump has marked the holiday with unannounced visits to the King memorial in Washington, but no such outing was expected this year.
Such a visit would have been complicated because Washington has become a fortress city of roadblocks and barricades before Wednesday's inauguration, as security officials work to avoid more violence following the Jan. 6 riot by a pro-Trump mob at the U.S. Capitol.
In a measure of how nervous the capital city has become, U.S. Capitol Police on Monday briefly locked down the Capitol complex and paused inaugural rehearsals after fire broke out at a nearby homeless encampment.
Biden transition officials, including incoming Homeland Security adviser Liz Sherwood-Randall and the deputy attorney general nominee, Lisa Monaco, held a videoconference with acting heads and career staff from national security agencies to discuss the security situation surrounding Inauguration Day.
Harris played down any personal security concerns, saying she's "very much looking forward to being sworn in."
"I will walk there, to that moment, proudly with my head up and my shoulders back," Harris told reporters after volunteering at a food bank.
Still, Washington residents were on high alert, and much of the city felt desolate, with large swaths of the area around the Capitol, White House and National Mall sealed off from all but authorized personnel.
Katie Henke, 40, a southwest D.C. resident, said the city felt on edge. She's concerned enough she packed a "go-bag" with clothes and other personal items in case she feels she must flee her neighborhood.
"This is legitimately scary," she said. "Between the pandemic and Trump, I feel like our country is at a weak and vulnerable point. And we know there are forces inside and outside the country that see that vulnerability as an opportunity to do something."
Some 25,000 National Guard troops were being dispatched across the city to bolster security. Monuments - including the King memorial - are closed to the public until after Wednesday's inaugural events.
Harris also resigned from her Senate seat Monday. She offered thanks to her California constituents in a farewell video posted on social media "for the honor of representing the place of my birth, as a proud daughter of California."
First lady Melania Trump also posted a farewell video in which she thanked Americans for the "greatest honor of my life," but she made no mention of the incoming Biden administration. Her husband has already announced he will not attend the inauguration - he's the first outgoing president to skip the ceremony in 152 years - and will depart for Florida hours before Biden's swearing-in.
And while Trump stayed out of view, the White House announced he had signed several executive orders, including an amended version of a previous order calling for the creation of "National Garden of American Heroes."
Trump wants more figures to be honored in his proposed garden, including the late pop singer Whitney Houston, game show host Alex Trebek and Grover Cleveland, the only U.S. president to serve nonconsecutive terms, to a list that already included George Washington, Thomas Jefferson, Frederick Douglass and dozens more.