(CNN) — President-elect Donald Trump’s team has signed an agreement with the White House unlocking key transition briefings and activities after a lengthy delay amid concerns, in part, over a mandatory ethics agreement.

“President-elect Trump is entering the next phase of his administration’s transition by executing a Memorandum of Understanding with President Joe Biden’s White House,” incoming White House chief of staff Susie Wiles said in a statement.

“This engagement allows our intended Cabinet nominees to begin critical preparations, including the deployment of landing teams to every department and agency, and complete the orderly transition of power,” Wiles continued.

The White House agreement, which was due October 1, serves as the gatekeeper for access to agencies and information and could lay the groundwork for Trump’s team to receive security clearances necessary to begin receiving classified information, although it was not immediately clear how that information sharing with the Biden administration would proceed.

“The Transition already has existing security and information protections built in, which means we will not require additional government and bureaucratic oversight,” the Trump transition said in a statement.

Trump’s team declined to sign a separate memorandum with the General Services Administration, due September 1, which would provide access to office space and secure communications, among other provisions.

White House spokesperson Saloni Sharma confirmed that Trump’s team signed the White House agreement, adding that the Biden administration and the GSA “repeatedly made the case” to Trump’s team to sign the pair of agreements starting in September.

President Joe Biden and his chief of staff, Jeff Zients, pressed Trump and Wiles to sign the agreements during their November 13 Oval Office conversation, people familiar with that conversation said, and Trump and Wiles expressed openness to moving forward. Zients, a person familiar said, met once more with Wiles on November 19 to stress the importance of starting transition briefings for national security and other continuity purposes.

With the White House agreement in place, members of the Biden administration can now begin to prepare their incoming counterparts for a handoff on January 20.

The signed agreement “will allow for certain, authorized members of the Trump transition team to have access to agency and White House employees, facilities, and information,” according to Sharma. White House officials said that federal agencies will receive guidance on facilitating secure information sharing with Trump’s team.

CNN has reached out to the Office of Management and Budget and the GSA for comment.

Trump team doesn’t sign GSA agreement

Trump’s team said it “will not use government buildings or technology provided by GSA (the General Services Administration) and will operate as a self-sufficient organization.” And the team “will not utilize taxpayer funding for costs related to the transition.”

Its existing ethics plan “will meet the requirements for personnel to seamlessly move into the Trump Administration,” it said, noting that that agreement will be posted to the GSA’s website.

The ethics plan was required to follow the Presidential Transition Act passed by Congress but it was not immediately published to the GSA’s website.

The Biden White House did “not agree” with the decision to forego the GSA agreement.

“While we do not agree with the Trump transition team’s decision to forgo signing the GSA MOU, we will follow the purpose of the Presidential Transition Act, which clearly states that ‘any disruption occasioned by the transfer of the executive power could produce results detrimental to the safety and wellbeing of the United States and its people,’” Sharma said.

There are certain safeguards in the signed White House memorandum, White House officials said, aimed at bolstering protections from conflicts of interest.

For instance, officials said, “The Trump transition team must provide the names and current employer of individuals who would have access to agencies, agency personnel, and government information,” and those who are receiving classified information must have “the security clearance necessary to have access to that information, the requisite need to know, and (have) signed the requisite non-disclosure agreements.”

Separately, the Trump team has yet to sign a memorandum of understanding with the Department of Justice, White House officials said, but “progress has been made towards an agreement.” The department, the officials noted, “is ready to process requests for security clearances for those who will need access briefing materials and national security information once the MOU is signed.”

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