The national security threats that top intelligence officials laid out for lawmakers on Wednesday were dominated by China’s efforts to expand its global influence and the “cascading crises” and “looming disequilibrium” facing the Biden Administration as existing security challenges are exacerbated by the fallout from the coronavirus pandemic. Their warnings, coupled with a written annual threats assessment released on Tuesday, signaled a diminishing focus on non-state terrorist groups like al-Qaeda and the Islamic State over the past two decades.