U.S. President-elect Joe Biden accused Trump loyalists at national security agencies of throwing up roadblocks to a smooth presidential transition and warned that adversaries could take advantage of the situation without better cooperation from the outgoing administration.

"We need to make sure nothing is lost in the hand-off between administrations,” he said after a meeting with his national security advisers as well as the teams responsible for the transition at related agencies. "Right now we just aren’t getting all the information that we need from the outgoing administration in key national security areas. It’s nothing short, in my view, of irresponsibility.”

Biden singled out political appointees at the Defense Department and Office of Management and Budget for "obstruction,” and called on them to bring him up to speed on force posture and budgeting "in order to avoid any window of confusion or catch-up that our adversaries may try to exploit.”