In a chilling letter to congressional leaders dated January 17, former federal law enforcement and national security officials spell out the danger of Biden's open border that "arises from the nature of the threat itself." "Wars and espionage and bombings and riots are sadly familiar delivery systems of instability, intimidation and insecurity," write the former senior FBI executives. "The country has faced these and more throughout its history and has held together, though not without struggle. The threat we call out today is new and unfamiliar," the veterans of federal law enforcement explain. "In its modern history the U.S. has...