Troy Miller ran Customs and Border Protection during a period of record illegal crossings along the U.S.-Mexico border. He is a 31-year veteran of the agency.

The document will not be published due to the "sensitivity of some of its findings," the officials, who spoke on condition of anonymity under White House ground rules, told the Associated Press.

President Joe Biden is facing mounting pressure from Democratic lawmakers and allies to extend protections to immigrants in the United States amid party fears over President-elect Donald Trump’s promise of mass deportations.

The memorandum is expected to serve as a roadmap for the incoming administration, helping it navigate critical international issues and threats. Officials in the Biden administration began drafting the document in the summer.