“Our adversaries aren’t waiting for the transition to take place,” says former Michigan Republican Rep. Mike Rogers, who was chairman of the House intelligence committee. “Joe Biden should receive the President’s Daily Brief starting today. He needs to know what the latest threats are and begin to plan accordingly. This isn’t about politics; this is about national security.”

U.S. adversaries can take advantage of the country during an American presidential transition and key foreign issues will be bearing down on Biden the moment he steps into the Oval Office.

Among them: Unless Trump extends or negotiates a new nuclear arms accord with Russia before Inauguration Day, Biden will have only 16 days to act before the expiration of the last remaining treaty reining in the world’s two largest nuclear arsenals. Perhaps U.S. spies have picked up tidbits about the Russians’ redlines in the negotiations, or about weapons it really wants to keep out of the treaty.

That’s the type of information that might be in the PDB, a daily summary of high-level, classified information and analysis on national security issues that’s been offered to presidents since 1946.