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With the inauguration just weeks away, President-elect Joe Biden on Monday said his transition team has "encountered roadblocks" from political appointees at the Defense Department and Office of Management and Budget.

"Right now, we just aren't getting all the information that we need from the outgoing administration in key national security areas," he added. "It's nothing short, in my view, of irresponsibility."

Biden made his remarks after attending a briefing with Vice President-elect Kamala Harris and national security experts. This "obstruction" could make it easier for foreign entities to launch cyber attacks against the U.S., and Biden warned his team "needs a clear picture of our force posture around the world and our operations to deter our enemies. We need full visibility into the budget planning underway at the Defense Department and other agencies in order to avoid any window of confusion or catch-up that our adversaries may try to exploit."

The president-elect stressed that career professionals have been working closely with the transition team, and their agencies are "filled with patriots who've earned our respect, and who should never be treated as political footballs."