Imagine that President Donald Trump is awoken by his national security adviser because of a threat to America. Among Trump's options: put American troops in harm's way, call for drone strikes or launch a nuclear weapon. Until Monday, the national security adviser, who is not subject to Senate confirmation, was retired Lt. Gen. Michael Flynn. After just 24 days on the job, Flynn entered the Guinness World Records for having served the shortest tenure as national security adviser. Among Flynn's transgressions was misleading Vice President Mike Pence about whether he discussed lifting sanctions with Russia's ambassador to the United States, Sergey Kislyak.