Biden fractures foot after fall, will likely be in walking boot 'for several weeks'

Shortly before the president-elect officially announced his picks for foreign policy and national security, former President Barack Obama weighed in with praise for the development of a team he said he has confidence in. 

Obama described Antony Blinken, who was Obama's deputy national security adviser and Biden's foreign policy adviser when he was vice president, as a trusted adviser and a skilled diplomat. Blinken was tapped for secretary of state.

"He was part of our inner circle in on our key meetings throughout my presidency. He's outstanding, a smart, gracious skilled diplomat, well regarded around the world, and I know he's going to do a great job," Obama said during a Washington Post Live event. 

Obama called Jake Sullivan, Biden's pick for national security adviser, a "wicked, smart, young, energetic" and "outstanding" selection.

"So you're seeing a team develop that I have great confidence in," Obama said, before cautioning that restoring allies' confidence in the U.S. will not be "restored overnight."

"There is going to be a lingering sense that America still divided. Some of the shenanigans that are going on right now around the election, that is making the world question how reliable and steady the U.S. may be," Obama said. "There's been some damage done that is going to take some time to dig ourselves out of."

-ABC News' Jordyn Phelps

Biden’s transition team has officially revealed the president-elect's choices for his incoming Cabinet. The selections announced Monday include:

• Antony Blinken, secretary of state
• Alejandro Mayorkas, secretary of homeland security
• Avril Haines, director of national intelligence
• Linda Thomas-Greenfield, U.S. ambassador to the United Nations
• Jake Sullivan, national security adviser
• Former Secretary of State John Kerry, special presidential envoy for climate

"Their accomplishments in diplomacy are unmatched, but they also reflect the idea that we cannot meet the profound challenges of this new moment with old thinking and unchanged habits -- or without diversity of background and perspective," Biden said in a statement.

The team also said Biden and Vice President-elect Kamala Harris will introduce the nominees at an event that will be live-streamed Tuesday at 1 p.m. ET.

-ABC News' Molly Nagle

Sen. Rob Portman of Ohio, an institutionalist Republican and avid Trump supporter, wrote in an op-ed for The Cincinnati Enquirer Monday that it's time to "move forward" with Biden's transition. 

"Based on all the information currently available, neither the final lawful vote counts nor the recounts have led to a different outcome in any state. In other words, the initial determination showing Joe Biden with enough electoral votes to win has not changed," Portman wrote.

Though he did not refer to Biden as “president-elect,” Portman went on to say it's "time to expeditiously resolve any outstanding questions and move forward."

"My hope is that all of us, as Americans, regardless of who we supported in the campaign, will be willing to accept the result because a thorough process was followed and the final vote count was clear," he added.

Portman is the latest Senate Republican to join a small but growing list calling for a full and formal transition process to begin. Trump's barrage of lawsuits has not swayed the court, resulting in just one win and at least 30 losses by an ABC News count.

-ABC News' Trish Turner

Biden’s White House senior staff is expanding ahead of his Cabinet announcement Tuesday. His transition announced two deputy directors of the White House Office of Legislative Affairs: Reema Dodin and Shuwanza Goff.

Dodin served as deputy chief of staff and floor director to the Senate Democratic Whip, Sen. Dick Durbin.

Goff served as floor director for the House of Representatives under House Majority Leader Steny Hoyer -- the first Black woman to hold the position.

This announcement brings the total number of Biden senior staff to 12: five men and eight women.

-ABC News' Molly Nagle