U.S. President Donald Trump defended his daughter Ivanka Trump on Monday after she took his place at a meeting of G-20 world leaders, raising some eyebrows and drawing sharp rebuke from the daughter of a rival former presidential candidate who was drawn into the fray.

"If Chelsea Clinton were asked to hold the seat for her mother, as her mother gave our country away, the Fake News would say CHELSEA FOR PRES!" he tweeted, referring to the daughter of Hillary Clinton, his Democratic rival in last year's presidential election.

Chelsea Clinton responded on Twitter: "Good morning Mr. President. It would never have occurred to my mother or my father to ask me. Were you giving our country away? Hoping not."