Presidential hopeful Donald Trump took the stage Monday at the Republican National Convention to introduce his wife and keynote speaker Melania Trump, vowing "we're going to win" against Hillary Clinton.

Trump beamed as his wife, a Slovenian-born former model, took the podium to a roar of applause, serving as the billionaire real estate tycoon's chief advocate after a chaotic opening day at the Cleveland confab.

"He does not give up," Melania Trump said of her husband. "If you want someone to fight for you and your country, I can assure you, he's the guy."