Former national security adviser Jake Sullivan backed his former boss — President Joe Biden, whose mental acuity is being reexamined in light of revelations in a new book — with Sullivan ...

And Jake Sullivan, former U.S. national security advisor under the Biden administration, warns that could be a big problem.

National security adviser Jake Sullivan said he believes the Biden administration is leaving President-elect Donald Trump in a very strong position globally. Speaking in a wide-ranging interview ...