Barron Trump, former president Donald Trump’s youngest son who has stayed out of the spotlight since his father entered politics, will not serve as one of Florida’s delegates to the Republican National Convention, the office of Melania Trump has announced.

In a statement released two days after Barron, 18, was selected to be an at-large delegate by the Florida Republican Party, Melania Trump’s office said that Barron was “honoured” to be chosen but that he “regretfully declines to participate due to prior commitments.”

The Trump campaign referred a request for comment to a spokesperson for Melania Trump, who did not immediately respond to questions about what those commitments might be.

Barron, who will graduate from high school next week and who plans to attend college in the fall, has largely not participated in his father’s political career.

Melania Trump has fiercely guarded her son’s privacy, even as some of his older siblings have been in the spotlight, campaigning for their father during the Republican primary while he and Melania Trump were largely absent from the trail.

Hours before her office released its statement, Donald Trump suggested in a radio interview that Barron, whom he called “good-looking” and “on the tall side,” was among his political advisers.

“He’s really been a great student. And he does like politics,” Trump said on Talk Radio 1210 WPHT in Philadelphia. “It’s sort of funny. He’ll tell me sometimes, ‘Dad, this is what you have to do.’”

Barron’s older brothers, Donald Jr and Eric, campaigned for their father this year during the Republican nominating contest, and both have become popular political figures in their own right. Both of them, as well as their sister Tiffany were among the 41 at-large delegates chosen by the Florida Republican Party for the national convention in July. Another sister, Ivanka Trump, who has not taken part in her father’s political ventures since she left the White House, was not.