"Trump is sui generis," one veteran Republican pollster told ABC News. "He is a unique figure in American politics."

From prominent attendees (and absences) to performers, here’s what to expect from the inaugural events as Trump retakes office.

Donald Trump will be sworn in as U.S. president on Monday, ushering in another turbulent four-year term with promises to push the limits of executive power, deport millions of immigrants, secure retribution against his political enemies and transform the role of the U.