Biden will move to release more doses of the COVID-19 vaccine when he takes office, a departure from the country's current procedure of withholding 50% of the supply to ensure second doses of the two-shot vaccine are available, a transition official said Friday.

“He supports releasing available doses immediately, and believes the government should stop holding back vaccine supply so we can get more shots in Americans' arms now. He will share additional details next week on how his Administration will begin releasing available doses when he assumes office on January 20th,” Biden spokesperson TJ Ducklo said in a statement.

A transition official told ABC News they have faith manufacturers can produce enough vaccines to ensure people can get their second doses in a timely manner, while also getting more people their first doses.

The official also noted the Biden administration has long pledged to use the Defense Production Act as needed to help produce materials to ensure supply.

-ABC News' Molly Nagle and Anne Flaherty

In a short statement, Col. Dave Butler, spokesperson for Chairman of the Joint Chiefs of Staff, confirmed the nation's top Gen. Mark Milley and House Speaker Nancy Pelosi spoke on the phone.

"Speaker Pelosi initiated a call with the chairman. He answered her questions regarding the process of nuclear command authority," Butler said.

Pelosi told her Democratic colleagues in a letter earlier Friday she reached out to discuss "available precautions" for preventing Trump "an unstable president" from accessing the nuclear launch codes or initiating military hostilities before he is out of office in 12 days.

-ABC News' Matt Seyler

A Twitter spokesperson said in a statement Friday: “In line with our statement yesterday, any future violations of the Twitter Rules, including our Civic Integrity or Violent Threats policies, will result in permanent suspension of the @realDonaldTrump account.”

The social media platform on Wednesday removed a video of Trump telling Capitol Hill rioters "we love you" and to "go home," requested the removal of three of Trump's tweets and slapped a 12-hour lock on Trump's account by Wednesday night.

"If the Tweets are not removed, the account will remain locked," the company added in a Tweet on its verified safety account at the time.

A Twitter spokesperson told ABC News on Thursday morning that Trump’s tweets were deleted.

-ABC News' Ben Gittleson

House Speaker Nancy Pelosi a letter to her Democratic colleagues said she reached out to the Chairman of the Joint Chiefs of Staff Mark Milley Friday morning to discuss "available precautions" for preventing Trump -- "an unstable president" -- from accessing the nuclear launch codes or initiating military hostilities before he is out of office in 12 days. She doesn't elaborate further on their discussion.

"This morning, I spoke to the Chairman of the Joint Chiefs of Staff Mark Milley to discuss available precautions for preventing an unstable president from initiating military hostilities or accessing the launch codes and ordering a nuclear strike. The situation of this unhinged President could not be more dangerous, and we must do everything that we can to protect the American people from his unbalanced assault on our country and our democracy," she said in the letter.

Pelosi said she is also still waiting to hear back from Vice President Mike Pence as to whether or not he intends to invoke the 25th Amendment ahead of House Democrats holding a call on their options on removing Trump from office at noon.

"If the President does not leave office imminently and willingly, the Congress will proceed with our action," she wrote.

-ABC News' Mariam Khan

At District of Columbia Mayor Muriel Bowser's request, Army Secretary Ryan McCarthy has activated about 340 unarmed D.C. National Guardsmen to assist local law enforcement with the demonstrations taking place on Wednesday pegged to the Electoral College certification.

"We think it's helpful to have our D.C. Guardsmen, who are our Guard, that I have requested from the Secretary of the Army to assist MPD [Metropolitan Police Department] with traffic management," Bowser said Monday. "It absolutely frees up more officers."

The D.C. Guard is unique in that any call-ups have to be made by the Army secretary and not the jurisdiction’s top elected official -- as is the case with state governors. Additionally, more focus has been given to the call-ups since the controversial presence of D.C. Guardsmen and the use of D.C. Guard helicopters during the Black Lives Matter demonstrations last summer.

"They will be deployed to assist us with crowd management, as well as traffic control in our nation's capital that will allow for the police officers to focus on anyone who's intent on instigating agitating or participating in violence in our city," said D.C. Police Chief Robert Contee. He also labeled any possibility of violence surrounding the protests as "unacceptable" and repeated that carrying firearms is not allowed under D.C. law.

A senior defense official said Bowser put in the request for Guardsmen on Dec. 31 and that it was approved Monday morning. Beginning Tuesday through Thursday, the 340 personnel will help man 30 traffic control checkpoints around the northern side of the downtown area close to the National Mall.

"No one's going to be armed or body armor or anything like that," said the official. "What they need is traffic control."

-ABC News' Luis Martinez and Quinn Owen