 His arrival came after he officially secured the delegates to become his party's nominee and announced his running mate, 39-year-old Ohio Senator J.D. Vance. Correspondent Matt Piper is in Milwaukee with a look at what's next. While Monday's theme was Make America Wealthy Once Again, tonight's theme is Make America Safe Once Again. It's believed the final speaker of the night will be Trump's one-time rival Nikki Haley.