For the past two years, we have convened a bipartisan group of Hoover and Stanford scholars to better understand foreign policy challenges and develop a strategy for the next administration — whomever wins — to address them. Our conclusion: U.S. foreign policy needs to get back to basics. A smart national security strategy starts with three guiding principles and focuses on three key strategic challenges: Russia, China, and “black swan” threats comprised of biological, nuclear, and cyber dangers.