Former US President Bill Clinton and 2016 Democratic presidential nominee Hillary Clinton will attend President-elect Donald Trump's inauguration as the 45th president of the US on January 20 in Washington, CNN reported.

The Clintons will join former Presidents George W. Bush and Jimmy Carter, who have also announced that they will attend.

Over the past few weeks Hillary Clinton discussed with advisers and friends whether or not she should attend the inaugural, said New York, quoting two sources.

She and President Clinton, the sources said, decided to do so out of a sense of duty and respect for the American democratic process.