US President Donald Trump's granddaughter has unveiled a

Don Jr.'s daughter stood near the 79-year-old Republican on Friday wearing one of her brand's pullovers, as he answered reporters' questions outside the White House.

"This is Kai, by the way," he told the Washington press corps, introducing his 18-year-old granddaughter who had given a short speech at last year's Republican National Convention.

The pair, both keen golfers, then boarded a helicopter as they headed off to attend the sport's Ryder Cup competition.

The eldest of the US president's grandchildren, who is expected to join the golf team at the University of Miami next year, announced the launch of her

A website selling the brand's $130 sweatshirts -- plain crew necks with her initials on the chest and her signature at

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