Donald Trump is only the second U.S. president elected to two non-consecutive terms. The first was Grover Cleveland, who bore many similarities to the president-elect during his 19th-century political career,

Donald J. Trump, a billionaire businessman whose meteoric rise in politics has repeatedly defied odds and reshaped the Republican Party, will be sworn in as the nation’s 47th president

Observers expect a different tone from the leader who talked about "American carnage" as he started his first term.